Guide Infection Control Research Articles

Investigation of a Norovirus GII.4Sydney[P16] outbreak in a care facility in Portugal, 2022

Abstract Background On the 29th of April 2022 the local Public Health unit was notified of 12 cases of acute gastroenteritis in residents of a long-term care facility (LTCF). A joint epidemiological investigation team was established and initiated an outbreak investigation to characterize the outbreak and implement infection control measures. Methods Epidemiological questionnaires were administered to staff (n = 44) and residents (n = 60). Case definition was LTCF residents or staff members with at least one of the following symptoms: diarrhoea, vomiting, nausea, between April 25th and May 14th, 2022. Stool or vomit samples were collected for 11 individuals. To assess environmental contamination fifteen food samples from previous meals and six surface samples from toilet faucets, wash tubs, and cutting boards were collected. Spatial distribution of cases within the LTCF was performed to guide infection control implementation. Results A total of 43 people met the case definition. Attack rates in residents and staff were 37% (23/63) and 42% (20/48), respectively. Of the total tested specimens, six (6/8) from residents and two (2/3) from staff were positive for the Norovirus (NoV) GII.4 Sydney [P16] variant by genotyping. Two (2/6) samples from surface swabs from the toilet faucet in the resident’s living room were also positive for NoV GII. Food samples were negative for major bacterial agents implicated in gastrointestinal outbreaks. Cases were distributed throughout the LTCF wards with no clear clustering. Four residents required hospital admission. Conclusions Results suggest person-to-person as well as environmental transmission of NoV. Identification of behavioural and spatial patterns of residents and staff and subsequent enactment of infection control strategies mitigated the outbreak. These findings reinforce the need for public health to maintain continuous technical support to LTCF on the implementation of infection control best practices. Key messages • Outbreak investigation in LTCF confirms Norovirus transmission, emphasizing the importance of infection control measures in long-term care facilities. • Study reveals Norovirus outbreak in LTCF, underscores the role of person-to-person and environmental transmission, highlighting the need for robust infection control protocols.

B-205 Performance of a Novel Fluorogenic Assay for Detection of Carbapenemase-producing Enterbacteriaceae

Abstract Background In recent years, under the selective challenge of antibiotics, the variety and number of drugresistant pathogenic microorganisms have increased significantly, which brings great challenges to clinical diagnosis and treatment, especially the infection caused by carbapenem resistant Enterobacteriaceae (CRE). Carbapenemases production is the main mechanism of drug resistance of Enterobacteriaceae to carbapenems. Drug resistance of Carbapenems can be caused by three mechanisms, resulting in the production of five major Carbapenemases. These are Klebsiella pneumoniae enzyme (KPC), New Delhi metal β-lactamase (NDM), carbapenem hydrolyzed oxalase (OXA-48 like), integrin-encoded metal β- lactamase (VIM) and IMP (Imipenemase). The real-time fluorescence quantitative PCR (qPCR) method based on molecular beacons was combined with the melting curve analysis to identify five drug resistance genes simultaneously by a single PCR reaction, with rapid detection, high sensitivity and strong specificity. Based on this principle, we developed the novel fluorogenic assay for rapid detection of Carbapenemases in multidrug-resistant Enterobacteriaceae (Dynamiker Biotechnology (Tianjin) Co., Ltd.). Methods We evaluated the performance of the novel fluorogenic assay for rapid detection of Carbapenemases in multidrug-resistant Enterobacteriaceae, including the limit of detection (LoD) and cross-reactivity, and compared it with the lateral flow immunochromatography assay (LFA). Results The LoD ranged from 75-450 CFU/mL for the five carbapenemase genes. The analytical specificity for target genes was 100%, as assessed with a panel of 15 pathogens, which indicated no cross-reactions. Comparison of qPCR and LFA results from twenty-three CRE clinical isolates with characterized carbapenemase content demonstrated a complete agreement (Table 1). Conclusions The novel fluorogenic assay for rapid detection of Carbapenemases in multidrug-resistant Enterobacteriaceae is an accurate and rapid method to identify KPC, NDM, VIM, IMP and OXA-48-like carbapenemases in the clinical microbiology laboratory, which can guide infection control programs to limit the spread of these organisms.

Outbreak of New Delhi Metallo-β-lactamase-producing Escherichia coli in a Neonatal Intensive Care Unit, New York State

Background: Outbreaks of carbapenemase-producing (CP) organisms (CPOs), including carbapenem-resistant Enterobacterales (CRE), in neonatal intensive care units (NICUs) are not well documented. The Centers for Disease Control and Prevention (CDC) identifies CP-CRE as an urgent threat to United States (US) healthcare facilities. Wadsworth Center, the New York State (NYS) Department of Health’s (NYSDOH’s) public health laboratory, participates in CDC’s Antimicrobial Resistance Laboratory Network to provide CPO identification, characterization, and surveillance. NYSDOH investigated an outbreak of CP-CRE Escherichia coli (E. coli) infections in NICU patients reported by one hospital. Method: Hospital A reported a CRE E. coli outbreak in their NICU to NYSDOH, as required by NYS Sanitary Code. In response, epidemiologists reviewed case data, conducted case finding, and provided infection control guidance to the hospital. Hospital A continued NICU clinical surveillance and conducted colonization screening to detect additional cases of CRE E. coli. The Wadsworth Center Antimicrobial Resistance Laboratory Network tested isolates from affected patients for CP genes and performed whole genome sequencing (WGS) to determine the CP gene variant, multilocus sequence type (MLST), and relatedness by mutation event (ME) analysis. NYSDOH epidemiologists assessed Hospital A’s infection control practices in affected areas and provided recommendations. Result: Hospital A identified two CRE E. coli infections in NICU patients with overlapping admissions in June-July 2023. Retrospective surveillance identified a third CRE E. coli case in an adult medical intensive care unit patient on admission to Hospital A in June 2023, with prior hospitalization April-May 2023. WGS analysis identified the blaNDM-5 gene in all three CRE E. coli patient isolates. The two NICU patients’ isolates had the same MLST (361/650) and differed by 9 MEs, indicating relatedness to each other and not the adult patient’s (MLST 167/2). NICU patient colonization screening identified no additional blaNDM-5 E. coli cases. NYSDOH’s NICU infection control assessment found that both cases were in adjacent isolettes within three feet of each other. Clean isolettes, equipment, and supplies for new admissions were stored in the clinical care space, not in a separate clean area. Conclusion: CP-CRE is an urgent threat to US healthcare facilities, including hospital NICUs. Though the incidence and prevalence of CP-CRE blaNDM-5 E. coli are not well-defined in NY, single healthcare-associated cases in NICU populations represent an outbreak. The Wadsworth Center Antimicrobial Resistance Laboratory Network’s contributions complement traditional epidemiologic surveillance and investigation methods to provide more specific, comprehensive infection

Exploring the implementation of COVID‐19 infection control guidance in congregate living settings supporting those with intellectual and developmental disabilities

Exploring the implementation of <scp>COVID</scp>‐19 infection control guidance in congregate living settings supporting those with intellectual and developmental disabilities

Striving for Improved Infection Prevention and Control Practice: A Grounded Theory of Healthcare Workers' Struggles in Implementing Infection Prevention and Control Guidance in Uganda.

There is a scarcity of qualitative research focusing on the implementation of infection prevention and control (IPC) guidance in low-income countries. This study aimed to address this gap by exploring the perspectives of healthcare workers (HCWs) regarding the implementation of IPC guidance at the healthcare facility level in Uganda. The study also sought to generate a theoretical understanding of the processes involved in implementing IPC guidance in these settings. This robust qualitative research employed a design based on constructivist grounded theory methodology, conducting individual interviews with 13 frontline health workers such as doctors, nurses, nurse interns, and laboratory staff. The key findings of the study revealed that HCWs undergo a process of 'striving for improved practice' in their efforts to implement IPC guidance. This process involved four phases: recognising the importance of IPC, playing a role, encountering challenges, and overcoming challenges. However, achieving full implementation proved difficult due to various individual and organisational barriers presented by the low-income setting. HCWs employed improvisation as a means to overcome these obstacles. Additionally, the study identified enabling factors that facilitated the implementation of IPC guidance within these settings. This study is significant as it applies robust qualitative research methods to provide valuable evidence of HCWs' perspectives on an important topic in an under-researched context, with findings transferable to similar settings.

Rapid management of Serratia marcescens outbreak in neonatology unit in Singapore: Risk factors and infection control measures

We describe the investigations for control of two consecutiveSerratia marcescensoutbreaks inneonatology unit of Singapore General Hospital. Epidemiological investigations, environmental sampling and risk-factors analysis were performed to guide infection control measures. Active surveillance sampling of nasopharyngeal aspirate and/or stool from neonates was conducted during both outbreaks. Whole-genome-sequencing was done to determine clonal links. Retrospective case-control study was conducted for second outbreak to identify risk factors for S marcescens acquisition. In 2022, two genetically unrelated S marcescens outbreaks were managed involving five neonates in March 2022 (outbreak 1) and eight neonates in November 2022 (outbreak 2). A link to positive isolates from sinks in intensive care units and milk preparation room was identified during outbreak 1. Neonatal jaundice (aOR, 16.46; p-value= 0.023) and non-formula milk feeding (aOR, 13.88; p-value= 0.02) were identified as risk factors during second outbreak. Multiple interventions adopted were cohorting of positive cases, carriage-screening, enhanced environmental cleaning, and emphasis on alcohol-based handrubs for hand-hygiene. The two outbreaks were likely due to infection prevention practices lapses and favourable environmental conditions. Nosocomial S marcescens outbreaks in neonatology units are difficult to control and require multidisciplinary approach with strict infection prevention measures to mitigate risk factors.

COVID-19 case management in primary dental care settings in Yorkshire and the Humber.

Introduction Emerging guidance during the COVID-19 pandemic aimed to minimise transmission risk within dental settings. This service evaluation provides an overview of reported cases of COVID-19 among primary dental care staff within Yorkshire and the Humber.Methods Data for COVID-19 cases reported within dental practices between November 2020 and August 2021 were extracted from the Public Health England, Health Protection Zone database and summarised using descriptive statistics.Results In total, 421 cases across 223 dental practices were reported, with 221 close contacts and 77 outbreaks identified. Cases/contacts were highest among dental nurses (51/49%). Household and community (42/22%) were the most frequently reported sources of transmission, with the majority of staff-to-staff contacts (60%) occurring in communal/non-clinical areas.Discussion There was a low number of reported COVID-19 cases/contacts among dental professionals, with most cases suspected to have acquired the infection from outside of the dental setting. The majority of personal protective equipment breaches occurred within communal/non-clinical areas. When infection prevention and control guidance was followed, there were no incidences of staff or patients becoming contacts or cases.Conclusion With adherence to strict protocols, the risk of COVID-19 transmission in the dental setting was low within the context of this review. The evaluation highlighted the importance of collaborative working during the pandemic.

Epidemiology and infection control of vancomycin-resistant enterococci at a German university hospital: A three-year retrospective cohort study.

Vancomycin-resistant enterococci (VRE) occur in hospitalized patients, causing both infection and colonization. In recent years, there has been an increase in VRE in German and other hospitals, raising the question of how to control this epidemic best. To better understand the specific epidemiology and to guide infection control, we conducted a retrospective cohort study analyzing all patients with VRE at Hannover Medical School, a tertiary university clinic in Germany that specializes in solid organ transplantation. Epidemiologic and clinical characteristics of patients with VRE from 2015-2017 were collected. Basic epidemiologic parameters, including VRE incidence and incidence density, were calculated. Independent risk factors for nosocomial VRE infection compared to colonization were assessed using a logistic regression model. There were 1,492 VRE cases corresponding to 822 individual patients. The incidence was 0.8 VRE cases per 100 cases. A total of 536 (35.9%) of the 1,492 VRE cases were acquired nosocomially. Of the 1,492 cases, 912 cases had VRE-positive samples (894 Enterococcus (E.) faecium and 18 E. faecalis) in our hospital laboratory and the remaining cases were known VRE carriers. The vanB-phenotype was observed in 369 of the 894 (41.3%) E. faecium isolates and in 6 of the 18 (33.3%) E. faecalis isolates. There was an increase over time in the vanB-phenotype proportion in E. faecium (2015: 63 of 171, 36.8%, 2016: 115 of 322, 35.7% and 2017: 191 of 401, 47.6%). A total of 107 cases had a VRE infection (7.2% of all VRE cases) according to the criteria of the German National Reference Center for Surveillance of Nosocomial Infections. The remaining cases were only colonized. Among other factors, leukocytopenia (<1,000/μL), the use of a central venous catheter and the visceral surgery medical specialty were independently associated with nosocomial VRE infection. VRE imposed a relevant and increasing infection control burden at our hospital. Nosocomial VRE infection was predominantly found in certain medical specialties, such as hematology and oncology and visceral surgery. Infection control efforts should focus on these highly affected patient groups/specialties.

A severe acute respiratory coronavirus virus 2 (SARS-CoV-2) nosocomial cluster with inter-facility spread: Lessons learned.

Despite infection control guidance, sporadic nosocomial coronavirus disease 2019 (COVID-19) outbreaks occur. We describe a complex severe acute respiratory coronavirus virus 2 (SARS-CoV-2) cluster with interfacility spread during the SARS-CoV-2 δ (delta) pandemic surge in the Midwest. This study was conducted in (1) a hematology-oncology ward in a regional academic medical center and (2) a geographically distant acute rehabilitation hospital. We conducted contact tracing for each COVID-19 case to identify healthcare exposures within 14 days prior to diagnosis. Liberal testing was performed for asymptomatic carriage for patients and staff. Whole-genome sequencing was conducted for all available clinical isolates from patients and healthcare workers (HCWs) to identify transmission clusters. In the immunosuppressed ward, 19 cases (4 patients, 15 HCWs) shared a genetically related SARS-CoV-2 isolate. Of these 4 patients, 3 died in the hospital or within 1 week of discharge. The suspected index case was a patient with new dyspnea, diagnosed during preprocedure screening. In the rehabilitation hospital, 20 cases (5 patients and 15 HCWs) positive for COVID-19, of whom 2 patients and 3 HCWs had an isolate genetically related to the above cluster. The suspected index case was a patient from the immune suppressed ward whose positive status was not detected at admission to the rehabilitation facility. Our response to this cluster included the following interventions in both settings: restricting visitors, restricting learners, restricting overflow admissions, enforcing strict compliance with escalated PPE, access to on-site free and frequent testing for staff, and testing all patients prior to hospital discharge and transfer to other facilities. Stringent infection control measures can prevent nosocomial COVID-19 transmission in healthcare facilities with high-risk patients during pandemic surges. These interventions were successful in ending these outbreaks.

COVID-19 Community Response Team for Toronto Homeless Services and Congregate Living Settings: an evaluation of Hospital-Community partnership through COVID-19 vaccine provision

Individuals experiencing homelessness face unique physical and mental health challenges, increased morbidity and premature mortality. In Canada, it is estimated that 235,000 individuals experience homelessness annually, and 180,000 use emergency shelters each night. (1) COVID -19 creates a significant heightened risk for those living in congregate sheltering spaces. Individuals with a recent history of homelessness and diagnosed with COVID-19, are at significantly higher risk of hospitalization and death than those housed in Ontario communities (2). &#x0D; Women’s College Hospital (WCH) is an ambulatory hospital situated in downtown Toronto. In March 2020, WCH set up one of Toronto’s 14 COVID-19 assessment centres to facilitate free testing for SARS-CoV-2. Formed by a group of health care providers at WCH, the goal of the COVID-19 Community Response Team (CRT) was to support Toronto shelters and congregate living sites to manage and prevent outbreaks of SARS-CoV-2 using a collaborative model through onsite mobile testing; supporting the management and prevention of outbreaks; and providing infection prevention and control training and guidance. (3) In total, CRT leveraged this model of care with 49 shelter and congregate living sites from April 2020 to April 2021. From this, the WCH COVID-19 vaccine program emerged, where 14 shelters were regionally identified to co-design and support the administration of vaccine clinics within each sheltering site. This research seeks to evaluate the impact and importance of this partnership model and its future potential in community-centered integrated care. In this study, three areas of inquiry are addressed: (1) Vaccine program evaluation and lessons learned (e.g., What were barriers, facilitators, and lessons throughout the process? How were shelter staff and clients impacted?); (2) Perceptions on hospital/community partnership (e.g., What were overall perceptions of this partnership and strategy?); (3) Opportunities forward (e.g., How can this partnership between hospitals and shelters be sustained in the future to fulfill needs beyond COVID-19). &#x0D; Constructivist grounded theory (CGT) is used in this project to explore perceptions and experiences of this partnership. (4) CGT data analysis revealed five main categories, 16 subcategories, and one core category. The core category is “access to healthcare is a human right; understand our communities”. The main categories are COVID-19 response capacity, outbreak identification and management, barriers to the vaccine program, community-centred immediate shelter needs, and avenues for intersectoral relationship strengthening. In conclusion, three key takeaways emerged for health(care) policy and practice:&#x0D; 1.‘Health as a human right’ framework is an organizing principle in shelters but not necessarily in hospitals. How can hospitals adopt and integrate this framework at the policy level to operationalize an equity-based approach to care? &#x0D; 2.For hospitals, there are gaps in knowledge about community and shelter realities. Ongoing formal partnering between hospitals and communities is one way to bridge this gap. &#x0D; 3.Empowering shelter staff is crucial to the success of hospital-partnered programs and clinical interventions. &#x0D; Finally, this project calls attention to the urgent context-specific exploration needed to advance official hospital-community partnerships, where there is an everlasting commitment and accountability. &#x0D;

Molecular Characteristics, Antimicrobial Susceptibility, Biofilm-Forming Ability of Clinically Invasive Staphylococcus aureus Isolates.

This study aimed to investigate the molecular characteristics, antimicrobial resistance, and biofilm-forming ability of Staphylococcus aureus isolates from invasive infections. A total of 92 non-repetitive S. aureus isolates from invasive infections were analyzed by Multi-locus Sequence Typing (MLST), spa typing, and chromosomal cassette mec (SCCmec) typing. Antibiotic susceptibility testing was performed using the disk diffusion and agar dilution methods. Biofilm-forming ability was assessed using crystal violet assay. The presence and expression of biofilm-associated genes were examined using PCR and RT-qPCR. Among the 55 Methicillin-resistant S. aureus (MRSA) and 41 Methicillin-sensitive S. aureus (MSSA) isolates, ST59 (43.6%) predominated in MRSA, while ST7 (39.0%) was most common in MSSA. As expected, MRSA exhibited higher antibiotic resistance rates compared to MSSA isolates. Biofilm formation assays revealed that the majority of isolates (88.5%) produced biofilms, with 26.0% classified as strong producers (OD570 ≥ 1.0) and 62.5% as weak producers (0.2 ≤ OD570<1.0). MSSA exhibited a higher biofilm-forming ability than MRSA (P < 0.01), with variations across clones. Notably, ST7 isolates displayed greater biofilm-forming ability than other sequence types (ST59, ST5, and ST239). RT-qPCR results revealed that ST7 isolates exhibited higher expression levels of icaA compared to other sequence types. This study revealed significant molecular heterogeneity among invasive S. aureus isolates, with ST59 and ST7 as dominant clones. The strong biofilm-forming capacity of ST7 merits concern given its rising prevalence regionally. Continuous surveillance of emerging successful lineages is critical to help guide infection control strategies against invasive S. aureus infections.

Epidemiology and clinical characteristics of severe acute respiratory infections among hospitalized children under 5 years of age in a tertiary care center in Bangkok, Thailand, 2019–2020

BackgroundAcute respiratory infections (ARIs) are common in children and can range in severity from mild self-limiting illnesses to more severe conditions such as pneumonia and respiratory failure. Data on the epidemiology of viral and bacterial pathogens causing ARIs in children are scarce in this region. This study aimed to investigate the epidemiology and clinical manifestations of pathogens in children aged ≤5 years presenting with severe acute respiratory infection (SARI) in Bangkok, Thailand. The impact of rapid multiplex PCR-based testing on clinical management is also explored. MethodsThis cross-sectional study enrolled consecutive children aged ≤5 years presenting with SARI at a tertiary care centre in Bangkok, Thailand, between 2019 and 2020. Nasopharyngeal swabs were collected once at admission, and viral and bacterial pathogens were tested using the QIAstat-Dx respiratory panel. ResultsA total of 169 children were enrolled in this study. At least one pathogenic virus was detected in 91.7 % of participants. Based on the final diagnoses made upon discharge, 30.2 % had upper respiratory tract infection, whereas 66.3 % had lower respiratory tract infection. Pneumonia was the most common diagnosis (59.2 %). The most common pathogen identified was rhino/enterovirus (45.2 %), followed by respiratory syncytial virus (31.6 %) and parainfluenza virus (14.2 %). Co-infection was found in 15.4 % and was not associated with increased disease severity. ConclusionsThis study provides additional insights into the pathogen profiles, clinical diagnosis, and co-infection combinations of ARIs in hospitalized children. This information is useful for diagnosis and treatment of ARIs, as well as implementation of appropriate infection control measures and guidance for future vaccine policy development.

Revisiting the personal protective equipment components of transmission-based precautions for the prevention of COVID-19 and other respiratory virus infections in healthcare.

The COVID-19 pandemic highlighted some potential limitations of transmission-based precautions. The distinction between transmission through large droplets vs aerosols, which have been fundamental concepts guiding infection control measures, has been questioned, leading to considerable variation in expert recommendations on transmission-based precautions for COVID-19. Furthermore, the application of elements of contact precautions, such as the use of gloves and gowns, is based on low-quality and inconclusive evidence and may have unintended consequences, such as increased incidence of healthcare-associated infections and spread of multidrug-resistant organisms. These observations indicate a need for high-quality studies to address the knowledge gaps and a need to revisit the theoretical background regarding various modes of transmission and the definitions of terms related to transmission. Further, we should examine the implications these definitions have on the following components of transmission-based precautions: (i) respiratory protection, (ii) use of gloves and gowns for the prevention of respiratory virus infections, (iii) aerosol-generating procedures and (iv) universal masking in healthcare settings as a control measure especially during seasonal epidemics. Such a review would ensure that transmission-based precautions are consistent and rationally based on available evidence, which would facilitate decision-making, guidance development and training, as well as their application in practice.

PREVELANCE OF CARBAPENEMASE PRODUCING ORGANISMS AND MOLECULAR RAPID DETECTION OF DIFFERENT GENES FROM VARIOUS CLINICAL ISOLATES IN PATIENTS ADMITTED AT TERTIARY CARE HOSPITALS OF VADODARA

Introduction- Carbapenemase-producing organisms (CPO) have been identied as an urgent healthcare threat. The spread of carbapenemase-producing Enterobacterales (CPE) is a global health problem of great concern. Rapid detection of carbapenemase-producing organisms is clinically desirable for hospital infection control and antibiotic stewardship. Recently, an on-demand polymerase chain reaction (PCR) assay, namely, the Xpert CarbaR assay, that requires less than an hour of turnaround time, had been developed for CPO detection in clinical samples to identify and guide infection control programs to contain the spread of CPO within a hospital. Objective- Carba-R assay is a qualitative multiplex real-time PCR method that qualitatively detects and differentiates ve common carbapenemase genes blaKPC, blaNDM, blaVIM, blaOXA-48, and blaIMP) directly from clinical samples or puried colonies within approximately 1 hour. This benets hospitals and patients by facilitating timely Infection Prevention &amp; Control measures, thereby reducing risk of exposure, transmission and bed-days lost. Materials &amp; Methods- In this study, the Xpert Carba-R assay was evaluated for detection of the ve carbapenemase genes (blaKPC, blaNDM, blaIMP, blaOXA-48, and blaVIM) in total of 40 non duplicate various clinical samples of admitted patients in tertiary care hospitals of Vadodara. Result- We performed Carba-R on 40 isolates: 18 blood samples, 06 urine, 05 rectal swabs, 03 Endotracheal secretion, 03 Pus, 02 wound discharge, 01 Bronchoalveolar lavage uid, 01 sputum, and 01 ERCP stent isolates. 36/40 (90%) isolates had one or more carbapenemase genes. They were as follows: 19/40 (47.5%) both OXA48 and NDM , 12/40 (30%) NDM and 05/40(12.5%) OXA-48. There were 04/40 (10 %) isolates which were Carbapenem resistant on disc diffusion &amp; VITEK but none of the resistant genes were detected possibly due to other resistant mechanism like efux pump and porin channels. Klebsiella pneumoniae was the most common isolate with CR, 34/40 (85%). The most frequent genes encountered in Klebsiella pneumoniae were both OXA48 and NDM, 19/34 (55.88%), NDM 08/34 (23.53%) followed by OXA 48, 05/34 (14.71%) and Out of 34 Klebsiella isolates, 02 isolates failed to detect any of these ve carbapenemase genes. Conclusion- Xpert Carba-R assay provides good reliable results for detection and differentiation of ve carbapenemase genes in clinical isolates. Compared to bacterial culture followed by PCR identication of resistance genes from colonies, the Carba-R assay reduced turnaround time from 48 to 72 hours to less than 1 hour. Carbapenemase genes were detected by the Carba-R assay in Klebsiella pneumoniae (34/40), Escherichia coli (5/40), Acinetobacter spp (1/40). The Carba-R assay detected 19 both OXA48 and NDM (47.5%), 12 blaNDM (30% and 05 blaOXA-48 (12.5%) genes. Laboratory detection of these genes may help improve patient outcomes by tailoring therapy. This study was conducted for understanding the molecular epidemiology of Carbapenemase producing Enterobacteriaceae in a tertiary care hospital. The combined use of the Xpert Carba-R assay and culture produces rapid and reliable results for the active surveillance of CPO in patients

Evaluation of Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry for Molecular Typing of Acinetobacter baumannii in Comparison with Orthogonal Methods.

Colonization and subsequent health care-associated infection (HCAI) with Acinetobacter baumannii are a concern for vulnerable patient groups within the hospital setting. Outbreaks involving multidrug-resistant strains are associated with increased patient morbidity and mortality and poorer overall outcomes. Reliable molecular typing methods can help to trace transmission routes and manage outbreaks. In addition to methods deployed by reference laboratories, matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) may assist by making initial in-house judgments on strain relatedness. However, limited studies on method reproducibility exist for this application. We applied MALDI-TOF MS typing to A. baumannii isolates associated with a nosocomial outbreak and evaluated different methods for data analysis. In addition, we compared MALDI-TOF MS with whole-genome sequencing (WGS) and Fourier transform infrared spectroscopy (FTIR) as orthogonal methods to further explore their resolution for bacterial strain typing. A related subgroup of isolates consistently clustered separately from the main outbreak group by all investigated methods. This finding, combined with epidemiological data from the outbreak, indicates that these methods identified a separate transmission event unrelated to the main outbreak. However, the MALDI-TOF MS upstream approach introduced measurement variability impacting method reproducibility and limiting its reliability as a standalone typing method. Availability of in-house typing methods with well-characterized sources of measurement uncertainty could assist with rapid and dependable confirmation (or denial) of suspected transmission events. This work highlights some of the steps to be improved before such tools can be fully integrated into routine diagnostic service workflows for strain typing. IMPORTANCE Managing the transmission of antimicrobial resistance necessitates reliable methods for tracking outbreaks. We compared the performance of MALDI-TOF MS with orthogonal approaches for strain typing, including WGS and FTIR, for Acinetobacter baumannii isolates correlated with a health care-associated infection (HCAI) event. Combined with epidemiological data, all methods investigated identified a group of isolates that were temporally and spatially linked to the outbreak, yet potentially attributed to a separate transmission event. This may have implications for guiding infection control strategies during an outbreak. However, the technical reproducibility of MALDI-TOF MS needs to be improved for it to be employed as a standalone typing method, as different stages of the experimental workflow introduced bias influencing interpretation of biomarker peak data. Availability of in-house methods for strain typing of bacteria could improve infection control practices following increased reports of outbreaks of antimicrobial-resistant organisms during the COVID-19 pandemic, related to sessional usage of personal protective equipment (PPE).

Effect Analysis of Different Environmental Disinfection Methods on Reducing Contamination of Surfaces by the Omicron BA.2.2 Variant of SARS-CoV-2 and the Characteristics of Fomite Contamination in the Fever Clinic in the Out-Broken of Shanghai

This study aimed to investigate the effect of different environmental disinfection methods on reducing contaminated surfaces (CSs) by the Omicron BA.2.2 variant of SARS-CoV-2 in the fever clinic between March 20 and May 30, 2022, and to analyze the influences and related factors of CSs. This study includes survey data from 389 positive patients (SPPs) and 204 CSs in the fever clinic, including the CS type, disinfection method, length of time spent in the clinic, cycle threshold (CT) value, name, age, weight, mask type, mask-wearing compliance, hand-mouth touch frequency and sex. Associations between study variables and specified outcomes were explored using univariate regression analyses. Mask-wearing compliance had a significant negative correlation with CSs (r = − 0.446, P = 0.037). Among the 389 SPPs, 22 SPPs (CRP, 5.66%) caused CSs in the separate isolation room. A total of 219 SPPs (56.30%) were male. The mean age of SPPs was 4.34 ± 3.92 years old, and the mean CT value was 12.44 ± 5.11. In total, 9952 samples with exposure history were taken, including 204 (2.05%) CSs. Among the CSs, the positive rate of flat surfaces was the highest in public areas (2.52%) and separate isolation rooms (4.75%). Disinfection methods of ultraviolet radiation + chemical irradiation significantly reduced the CSs in both the public area (0% vs. 4.56%) and the separate isolation room (0.76% vs. 2.64%) compared with the chemical method alone (P < 0.05). Compared with ordinary SPPs, CRPs were older (6.04 year vs. 4.23 year), and the male proportion was higher (72.73% vs. 55.31%). In particular, it was found that SPPs contaminated their surroundings and therefore imposed risks on other people. Environmental disinfection with ultraviolet radiation + chemical treatment should be emphasized. The findings may be useful to guide infection control practices for the Omicron BA.2.2 variant of SARS-CoV-2.

Care Workers and Managers’ Experiences of Implementing Infection Control Guidance in an Epidemic Context: A Qualitative Study in the South East of England, during the COVID-19 Prevaccination Era

The national response to COVID-19 has had a severe impact on adult social care settings, with high mortality amongst people receiving and providing care in England. Care workers had to rapidly adapt to new infection control measures to protect themselves, their colleagues, and the people receiving care. Infection control in residential and domiciliary care is always complex, but COVID-19 infection control measures impacted exceptionally on care workers’ working and everyday lives. We undertook qualitative interviews with care workers and managers (n = 10) in residential and domiciliary care for older people in the Southeast England during the first wave of the pandemic to understand their experiences, solutions, and concerns to implement guidance in practice. Data were analysed using framework analysis, and the following eight themes were identified: (1) Increasing visibility and support for the sector; (2) the impact of negative messaging about the sector; (3) feelings of isolation; (4) accessibility and usability of guidance; (5) social care staff as agents in producing and sharing good practice; (6) managing expectations and the impact of conflicting messages in the media; (7) improving communication with hospitals; and (8) problems in the early pandemic. The findings reveal widespread concerns for the marginalisation of the sector in the policy response and the inadequacy of infection control guidance. Guidance would benefit from a better understanding of domiciliary and residential care settings. This might involve the following steps: (a) coproduction of guidance with adult social care stakeholders, including those in direct-care roles and (b) a shift away from a clinical model of infection control towards a more flexible approach that attends to the inherent variability of care settings.

Molecular surveillance reveals widespread colonisation by carbapenemase and extended spectrum beta-lactamase producing organisms in neonatal units in Kenya and Nigeria

ObjectivesNeonatal sepsis, a major cause of death amongst infants in sub-Saharan Africa, is often gut derived. Gut colonisation by Enterobacteriaceae producing extended spectrum beta-lactamase (ESBL) or carbapenemase enzymes can lead to antimicrobial-resistant (AMR) or untreatable infections. We sought to explore the rates of colonisation by ESBL or carbapenemase producers in two neonatal units (NNUs) in West and East Africa.MethodsStool and rectal swab samples were taken at multiple timepoints from newborns admitted to the NNUs at the University College Hospital, Ibadan, Nigeria and the Jaramogi Oginga Odinga Teaching and Referral Hospital, Kisumu, western Kenya. Samples were tested for ESBL and carbapenemase genes using a previously validated qPCR assay. Kaplan–Meier survival analysis was used to examine colonisation rates at both sites.ResultsIn total 119 stool and rectal swab samples were taken from 42 infants admitted to the two NNUs. Colonisation with ESBL (37 infants, 89%) was more common than with carbapenemase producers (26, 62.4%; P = 0.093). Median survival time before colonisation with ESBL organisms was 7 days and with carbapenemase producers 16 days (P = 0.035). The majority of ESBL genes detected belonged to the CTX-M-1 (36/38; 95%), and CTX-M-9 (2/36; 5%) groups, and the most prevalent carbapenemase was blaNDM (27/29, 93%).ConclusionsGut colonisation of neonates by AMR organisms was common and occurred rapidly in NNUs in Kenya and Nigeria. Active surveillance of colonisation will improve the understanding of AMR in these settings and guide infection control and antibiotic prescribing practice to improve clinical outcomes.

Transmission dynamics and associated mortality of nosocomial COVID-19 throughout 2021: a retrospective study at a large teaching hospital in London

The impact of nosocomial SARS-CoV-2 infections has changed significantly since 2020. However, there is a lack of up-to-date evidence of the epidemiology of these infections which is essential in order to appropriately guide infection control policy. To identify the secondary attack rate of SARS-CoV-2 infection and associated mortality across different variants of concern. A single-centre retrospective study of all nosocomial SARS-CoV-2 exposure events was conducted between 31st December 2020 and 31st December 2021. A secondary attack rate was calculated for nosocomial acquisition of SARS-CoV-2 infection and time to positivity. Positive contacts were assessed for all-cause 30-day mortality. A total of 346 sequential index exposure events were examined, and 1378 susceptible contacts identified. Two hundred susceptible contacts developed SARS-CoV-2 infection (secondary attack rate of 15.5%). The majority of index cases (59%) did not result in any secondary SARS-CoV-2 infection. Where close contacts developed SARS-CoV-2 infection, 80% were detected within the first five days since last contact with the index case. The overall associated mortality among positive contacts across 2021 was 9%, with an estimated reduction of 68% when comparing periods of high Omicron versus Alpha transmission. Our findings describe that most SARS-CoV-2 infections are detected within five days of contact with an index case; we have also demonstrated a considerably lower mortality rate with the Omicron variant in comparison to previous variants. These findings have important implications for informing and supporting infection control protocols to allow movement through the hospital, and ensure patients access care safely.

Infection Prevention and Control Practices among Staff Nurses in Hail, KSA: Basis for Improved Patient Safety

Aim: Hospital acquired infections are preventable with proper healthcare behavior among workers and strict compliance. This study aimed to determine the infection prevention and control practices by staff nurses. Methods: This study utilized the correlational approach in exploring the infection prevention and control practices among nurses in government hospitals in Ha'il region Kingdom of Saudi Arabia. There were 189 respondents resulting from convenience sampling. Descriptive statistics were used to represent the demographic profiles and scores of the participants while Spearman's rho was used to determine the significant relationship between the four (4) dimensions in IPC practice. Data gathering was conducted between November and December 2019. Results: The infection prevention and control guidance (89.96±10.74), healthcare associated infection associated infection (84.92±9.49), and built environment, material and equipment (86.23±12.03) were found to have an advanced level while infection control programme is intermediate in level (29.99±3.99). Meanwhile, a weak positive correlation on (r=0.191; p&lt;.008) found in infection and control programmed and infection prevention; and IPC programmed level and built materials and equipment ( r = 0.16; p&lt;.028). There is a medium level of correlation between the level of practice in Built materials and equipment (r =– 0.327). Conclusion: The four dimensions, the level of practice for the Infection Prevention and Control Programme is found to be Intermediate. Whereas, the other three dimensions, Infection Prevention and Control Guidelines, Healthcare-Associated Infections Surveillance, and Built Environment, Materials and Equipment for Infection Prevention and Control at the Hospital Level, showed an Advanced level of practice by the staff nurses. overall, the IPC level of practice among nurses is described to be Advanced. The IPC core components are fully implemented according to the WHO recommendations and appropriate to the needs of the facility.