Suspected Infection Research Articles

Lack of Diagnostic Value from Fungal and Mycobacterial Cultures in Cases of Suspected Prosthetic Joint Infection

Abstract Introduction/Objective Infections of prosthetic joints cause significant morbidity and often result in removal of the infected joint. In many cases, an infectious etiology can be difficult to definitively identify. As a result, providers suspecting prosthetic joint infections (PJI) often place large order sets of microbiology tests, including fungal and mycobacterial cultures. Fungal and mycobacterial cultures are labor-intensive for the laboratory taking up to 28 days and 42 days, respectively, to complete. As a potential area for a diagnostic stewardship intervention, we wanted to evaluate how often a fungal or mycobacterial culture produced actionable information in cases of suspected PJI. Methods/Case Report Data reports were retrieved from both the Electronic Health Record (EHR) and the Laboratory Information System (LIS) from May 2022 to May 2023. As sources submitted by the provider often do not specify that the joint is prosthetic, data from LIS was evaluated to identify microbiology culture test sets ordered on joint sources, while data from EHR was examined to isolate patients with implanted joints. Using Microsoft Excel, data from both systems was compared in order to match microbiology culture test sets to the known implanted joints. LIS data from implanted joint sources was assessed to record negative (no growth) and positive (growth) cultures, and to register all organisms isolated. Results (if a Case Study enter NA) Of 794 order sets for cultures collected from prosthetic joint sources, 430 included requests for fungal culture and 79 included requests for mycobacterial culture. Of these 79 requests for mycobacterial culture, 0 organisms were isolated (0%). Of these 430 requests for fungal culture, 7 grew yeast (1.6%) and 7 out of 7 (100%) of these yeasts were also isolated on general (aerobic bacterial) culture. No molds were isolated. Conclusion Discontinuing the routine practice of ordering fungal and mycobacterial culture for prosthetic joint sources would have no negative impact on patient care but would reduce unnecessary work in the microbiology laboratory and potentially avoid additional costs to the patient. Education to the orthopedic provider group as well as best practice alerts in the EHR will be pursued, based on the findings from this study, in order to reduce unnecessary culture orders.

The Symptomatic Expression in Chinese Patients with Suspected COVID-19 Omicron Variant Infection: A Clinical Case Registry Study

Little systematic research has been conducted into the symptomatic expression of COVID-19 infections in patients. It is known that symptomatic expression varies between patients, but the nature and extent of this variability is poorly understood. This paper elaborates on the symptoms reported by Chinese patients infected with COVID-19 during the Omicron wave, and compares this with available data from other countries. This was an observational clinical case registry study of Chinese patients with suspected Omicron variant COVID-19 infection. Symptoms were prospectively collected via a 171-item questionnaire and entered into the Clificol COVID-19 Clinical Case Registry. Two types of symptoms were distinguished: A) common clinical symptoms as identified by a search of available/published data, and B) homeopathic symptoms, used for the selection of the most suitable homeopathic medicine. Data were mainly analysed descriptively. Additionally, we compared the prevalence of the reported symptoms with available symptom data from the UK and France. Twenty one Chinese practitioners collected questionnaires on 388 cases that received a first homeopathic prescription between 5 December 2021 and 8 April 2022. With respect to A), the most frequently reported clinical symptoms were respectively cough (71%), fever (65%), extreme tiredness (58%), headache (51%), sore throat (46%), runny nose (34%), unusual muscle pains (31%), hoarseness (21%), eye soreness (8%) and brain fog (6%). With respect to B), homeopathic symptoms related to cough and fever were particularly prevalent. This study identified the reported symptoms of Chinese COVID-19 patients with suspected Omicron variant infection. A more detailed understanding of the clinical presentation of COVID-19 variants in different countries is important for the selection of test-triggering symptoms.

The Diagnostic Yield of [18F]FDG-PET/CT in a Heterogeneous In-Patient Population with Suspected Infection or Inflammation Is Comparable to Findings in Patients with Classic Fever of Unknown Origin.

Suspected infection or inflammation of unknown origin in in-patients remains challenging. Literature on [18F]FDG-PET/CT is abundant in classic fever of unknown origin (FUO), but evidence is complex and may not always reflect clinical reality. This study explores the application of [18F]FDG-PET/CT in a diverse clinical population of in-patients with suspected infection not defined by stringent FUO-criteria. Retrospective chart review of consecutive in-patients who underwent [18F]FDG-PET/CT in the workup of suspected infection or inflammation from 1 July 2022 to 31 December 2022 was conducted. We evaluated indications, diagnostic yield, and clinical impact of [18F]FDG-PET/CT, and compared the findings of [18F]FDG-PET/CT and stand-alone CT. Univariate logistic regression assessed associations between [18F]FDG-PET/CT outcome and clinical parameters. Receiver operating characteristic curve (ROC) analysis evaluated diagnostic performance. 77 patients met the inclusion criteria. [18F]FDG-PET/CT established a diagnosis in 35% of cases, ruled out focal infection in 26%, and thus was helpful in 61% of patients. It prompted 72 additional examinations resulting in seven incidental diagnoses, including two cancers. Antibiotic treatment was changed in 26% of cases. Regression analysis found white blood cell counts (WBC) associated with true positive outcomes. [18F]FDG-PET/CT was compared to stand-alone CT findings, and was concordant in 69% of cases. Results were comparable to findings in more classic FUO. [18F]FDG-PET/CT was clinically helpful in 61% of cases but also prompted many additional examinations with relatively few clinically important findings. WBC count was a predictor of true positive outcome. CT and [18F]FDG-PET/CT were discordant in 31%, of cases, especially in cases of endocarditis and spondylodiscitis.

Is Aggressive Surgery Always Necessary for Suspected Early-Onset Surgical Site Infection after Lumbar Surgery? A 10-Year Retrospective Analysis.

Surgical site infection (SSI) after spinal surgery is still a persistent worldwide health concern as it is a worrying and devastating complication. The number of samples in previous studies is limited and the role of conservative antibiotic therapy has not been established. This study aims to evaluate the clinical efficacy and feasibility of empirical antibiotic treatment for suspected early-onset deep spinal SSI. We conducted a retrospective study to identify all cases with suspected early-onset deep SSI after lumbar instrumented surgery between January 2009 and December 2018. We evaluated the potential risks for antibiotic treatment, examined the antibiotic treatment failure rate, and applied logistic regression analysis to assess the risk factors for empirical antibiotic treatment failure. Over the past 10 years, 45 patients matched the inclusion criteria. The success rate of antibiotic treatment was 62.2% (28/45). Of the 17 patients who failed antibiotic treatment, 16 were cured after a debridement intervention and the remaining one required removal of the internal fixation before recovery. On univariate analysis, risk factors for antibiotic treatment failure included age, increasing or persisting back pain, wound dehiscence, localized swelling, and time to SSI (cut-off: 10 days). Multivariate analysis revealed that infection occurring 10 days after primary surgery and wound dehiscence were independent risk factors for antibiotic treatment failure. Appropriate antibiotic treatment is an alternative strategy for suspected early-onset deep SSI after lumbar instrumented surgery. Antibiotic treatment for suspected SSI occurring within 10 days after primary surgery may improve the success rate of antibiotic intervention. Patients with wound dehiscence have a significantly higher likelihood of requiring surgical intervention.

Laboratory Tests, Bacterial Resistance, and Treatment Options in Adult Patients Hospitalized with a Suspected Urinary Tract Infection.

Patients treated for systemic urinary tract infections commonly have nonspecific presentations, and the specificity of the results of the urinalysis and urine cultures is low. In the following narrative review, we will describe the widespread misuse of urine testing, and consider how to limit testing, the disutility of urine cultures, and the use of antibiotics in hospitalized adult patients. Automated dipstick testing is more precise and sensitive than the microscopic urinalysis which will result in false negative test results if ordered to confirm a positive dipstick test result. There is evidence that canceling urine cultures if the dipstick is negative (negative leukocyte esterase, and nitrite) is safe and helps prevent the overuse of urine cultures. Because of the side effects of introducing a urine catheter, for patients who cannot provide a urine sample, empiric antibiotic treatment should be considered as an alternative to culturing the urine if a trial of withholding antibiotic therapy is not an option. Treatment options that will decrease both narrower and wider spectrum antibiotic use include a period of watching and waiting before antibiotic therapy and empiric treatment with antibiotics that have resistance rates > 10%. Further studies are warranted to show the option that maximizes patient comfort and safety.

Congenital Pulmonary Airway Malformation with Suspected Nontuberculous Mycobacterium Infection.

Congenital Pulmonary Airway Malformation with Suspected Nontuberculous Mycobacterium Infection.

Cytomegalovirus infection as a rare cause of colitis.

A 62 year-old-man with low anterior rectal resection and protective ileostomy, for low rectal neo and neoadjuvant QT +RT. Then ileostomy closure without incidences. On the 3rd postoperative day, he started with fever peaks and diarrhea. An abdominal CT scan showed diffuse thickening of the wall of the descending colon compatible with colitis and colonoscopy showed deep rectal ulcers with punch-like morphology with hyperemic mucosa with erythematous stippling of erosive appearance, showing this ulcerative pattern with numerous lesions and intensely edematous and congestive mucosa covered with abundant fibrinopurulent exudate in the descending colon. Biopsies and stool cultures were negative, but serologies were positive for CMV. Suspected CMV infection in a immunosuppressed by chemotherapy patient, he was treated with ganciclovir. The patient presented clinical improvement, without fever or diarrhea and improvement of the punch ulcers in the endoscopic controls, so he could be discharged from the hospital with follow-up in the outpatient consulting offices.

A Simple Bacteremia Score for Predicting Bacteremia in Patients with Suspected Infection in the Emergency Department: A Cohort Study.

Bacteremia is a life-threatening condition that has increased in prevalence over the past two decades. Prompt recognition of bacteremia is important; however, identification of bacteremia requires 1 to 2 days. This retrospective cohort study, conducted from 10 November 2014 to November 2019, among patients with suspected infection who visited the emergency department (ED), aimed to develop and validate a simple tool for predicting bacteremia. The study population was randomly divided into derivation and development cohorts. Predictors of bacteremia based on the literature and logistic regression were assessed. A weighted value was assigned to predictors to develop a prediction model for bacteremia using the derivation cohort; discrimination was then assessed using the area under the receiver operating characteristic curve (AUC). Among the 22,519 patients enrolled, 18,015 were assigned to the derivation group and 4504 to the validation group. Sixteen candidate variables were selected, and all sixteen were used as significant predictors of bacteremia (model 1). Among the sixteen variables, the top five with higher odds ratio, including procalcitonin, neutrophil-lymphocyte ratio (NLR), lactate level, platelet count, and body temperature, were used for the simple bacteremia score (model 2). The proportion of bacteremia increased according to the simple bacteremia score in both cohorts. The AUC for model 1 was 0.805 (95% confidence interval [CI] 0.785-0.824) and model 2 was 0.791 (95% CI 0.772-0.810). The simple bacteremia prediction score using only five variables demonstrated a comparable performance with the model including sixteen variables using all laboratory results and vital signs. This simple score is useful for predicting bacteremia-assisted clinical decisions.

Procalcitonin Levels in Identifying Bacterial Infections in Children with and without COVID-19.

Elevated procalcitonin levels have been associated with bacterial infection in children. Observational studies reported high procalcitonin values in COVID-19. Data on bacterial coinfections in pediatric COVID-19 is sparse; small studies suggest a low coinfection rate. In this study, we aimed to quantify the positive predictive value (PPV) of procalcitonin in identifying bacterial infection in children with and without COVID-19. A retrospective chart review was performed for 215 children <21 years admitted to our tertiary children's hospital between February 1, 2013, and July 15, 2020, who had procalcitonin levels measured within 48 hours of admission. Confirmed bacterial infection was defined as positive blood, urine, or cerebrospinal fluid (CSF) culture, positive endotracheal culture with evidence of leukocytosis on Gram stain, or pneumonia by chest radiograph. Suspected bacterial infection was defined as confirmed bacterial infection or administration of antibiotics for >48 hours. Of the 215 patients, 73 were admitted for COVID-19 (66% multisystem inflammatory syndrome in children [MIS-C], 34% acute COVID-19). The PPV of an elevated procalcitonin level >1.0 ng/mL in identifying suspected bacterial infections for those with MIS-C was 6.3% (95% CI=0-15), in acute COVID-19 was 29% (95% CI=0-62%), and in the non-COVID-19 cohort was 75% (95% CI=62-88%). For identification of confirmed bacterial infection, PPV of an elevated procalcitonin level was 0% in MIS-C, 14% (95% CI=0-40%) in acute COVID-19, and 55% (95% CI=40-69%) in the non-COVID-19 cohort. We found a low PPV of elevated procalcitonin level above 1 ng/mL in identifying either culture-confirmed or presumed bacterial infection in children hospitalized with COVID-19-related illness.

Performance of the FebriDx Rapid Point-of-Care Test for Differentiating Bacterial and Viral Respiratory Tract Infections in Patients with a Suspected Respiratory Tract Infection in the Emergency Department.

FebriDx is a rapid point-of-care test combining qualitative measurements of C-reactive protein (CRP) and Myxovirus Resistance Protein A (MxA) using a disposable test device to detect and differentiate acute bacterial from viral respiratory tract infections. The goal of this study was to investigate the diagnostic accuracy of FebriDx in patients with suspected respiratory tract infections in the emergency department (ED). This was an observational cohort study, performed in the ED of an academic hospital. Patients were included if they had a suspected infection. The primary outcome was the presence of a bacterial or viral infection, determined by clinical adjudication by an expert panel. The sensitivity, specificity, and positive and negative predictive value of FebriDx for the presence of bacterial versus non-bacterial infections, and viral versus non-viral infections were calculated. Between March 2019 and November 2020, 244 patients were included. A bacterial infection was present in 41%, viral infection was present in 24%, and 4% of the patients had both viral and bacterial pathogens. FebriDx demonstrated high sensitivity in the detection of bacterial infection (87%), high NPV (91%) to rule out bacterial infection, and high specificity (94%) for viral infection in patients with a suspected infection in the ED.

A Systematic Literature Review to Identify Diagnostic Gaps in Managing Immunocompromised Patients With Cancer and Suspected Infection.

Patients with cancer are increasingly vulnerable to infections, which may be more severe than in the general population. Improvements in rapid and timely diagnosis to optimize management are needed. We conducted a systematic literature review to determine the unmet need in diagnosing acute infections in immunocompromised patients with cancer and identified 50 eligible studies from 5188 records between 1 January 2012 and 23 June 2022. There was considerable heterogeneity in study designs and parameters, laboratory methods and definitions, and assessed outcomes, with limited evaluation of diagnostic impact on clinical outcomes. Culture remains the primary diagnostic strategy. Fewer studies employing molecular technologies exist, but emerging literature suggests that pathogen-agnostic molecular tests may add to the diagnostic armamentarium. Well-designed clinical studies using standardized methodologies are needed to better evaluate performance characteristics and clinical and economic impacts of emerging diagnostic techniques to improve patient outcomes.

986. Clinical Utility of 16S rRNA Sequencing and Impact on Outcomes in Adults with Suspected Infection

Abstract Background Targeted antimicrobial regimens rely on prompt isolation and identification of the pathogen. When conventional gold standard culture-based methods fail to identify a pathogen, broad range PCR and next-generation 16S rRNA sequencing has emerged as a clinically useful and increasingly frequent diagnostic tool. However, its impact in clinical decision making and effect on outcomes, particularly with negative results, remains poorly elucidated. This study aims to evaluate the clinical impact of 16S rRNA in adult infections. Methods A retrospective analysis was performed on clinical specimens analyzed by 16S rRNA from August 2016 to December 2021 in our institution. Electronic medical records were reviewed to determine if 16S rRNA results had clinical utility, defined as prompting a change or stop of therapy or confirming the prescribed antimicrobial regimen. Antimicrobial-related events, readmission and infection-related mortality at 90 days were the outcomes of interest and were compared between groups using the Fisher's exact test. Results Three hundred fifty-nine samples were included in the analysis. Clinical utility was identified in 108 (30.1%) specimens including 45 (41.7%) with negative 16S rRNA results (Figure 1). The most common pathogens identified were skin flora (19.4%) and Streptococci spp. (13.9%). Body fluid specimens yielded the most clinical utility (62.5%) followed by cranial samples (60%) and valve/endovascular graft samples (52%) (Figure 2). Readmissions were significantly lower in the clinical utility group compared to the no clinical utility group (10.5% vs 19.8%, p=0.04, 95% confidence interval 0.21-0.99) (Table 1). Mortality and adverse events were not statistically different between the two groups.Figure 1.Proportion of clinical specimens stratified by clinical impact of 16S rRNA sequencing.De-escalation of antibiotics = narrowing coverage or shortening course. Confirmation of antibiotic regimen = confirming current coverage, escalation of coverage, or lengthening course. Infectious process ruled out = low baseline suspicion for infection. No change = negative 16S rRNA result or those lost to follow-up (true negative utility). Inapplicable 16S rRNA = positive culture result before 16S rRNA result or intended therapy less than or equal to 14 days.Figure 2.The clinical utility of 16S rRNA sequencing results by clinical specimen type.Body fluid included pericardial fluid, peritoneal fluid, middles ear fluid, and cyst/seroma fluid. LN: lymph node, BAL: bronchoalveolar lavage, CSF: cerebrospinal fluid.Table 1.Comparison of outcomes between clinical utility and no clinical utility groups.LTFU: lost to follow-up, CI: confidence interval. Conclusion Both positive and negative 16S rRNA results have clinical utility in our study with body fluid specimens having the highest clinical utility. Readmissions were statistically lower in cases with clinical utility, while adverse events and mortality were numerically lower but not statistically significant. To our knowledge, this is the first study to demonstrate the impact of negative 16S rRNA results in adult infections, and further studies are needed to determine the most effective application for patient care. Disclosures Lisa M, Stempak, MD, Cytovale Inc: Advisor/Consultant

1031. Can We Safely Reduce Unnecessary Blood Cultures in Patients with Suspected Infection in the Emergency Department? The PredictED Study to Develop and Validate a Bacteremia Prediction Model

Abstract Background Blood cultures are commonly used at emergency departments (EDs), while only 5-10% yields a relevant pathogen. We aimed to develop an automatable prediction model in ED patients with suspected bacteremia. This may reduce the use of blood cultures and prevent potential harm from false-positive blood cultures, while minimizing the risk of missing positive cultures. Methods In this observational study, we included consecutive adult patients who had a blood culture taken at the ED of the Haga Teaching Hospital, the Netherlands, for a one-year period. Demographics, laboratory, and outcome data were collected from electronic patient records. We defined 23 candidate predictors for our “full model”, of which nine were used for the "basic" model because they are readily automatable (Table 1). Regression analysis with the Least Absolute Shrinkage and Selection Operator was used to define the model. Bootstrapping was performed for internal validation, including imputation of missing values. We assessed discriminative performance using the C-statistic and calibration using the calibration intercept and slope. Clinical utility was assessed by sensitivity, specificity, negative and positive predictive values and decision curves. Results We included 2111 unique patients; mean age 63 years and 46% male. 272 patients had true positive blood cultures (13%); 79 patients (3.7%) had contaminated blood cultures. Our basic model included 8 predictors: age, systolic blood pressure, heart rate, breathing frequency, temperature, Glasgow coma score, C-reactive protein, procalcitonin. The corrected C-statistic was 0.81 (95% CI 0.79-0.83). The full model additionally included recent antibiotic use, indwelling vascular catheter, chills, and suspected infection site. The corrected C-statistic was 0.87 (95% CI 0.85-0.88). Calibration was good for both models. Sensitivity for bacteremia was 97.4% in the basic model, saving 18% of blood cultures (Table 2). The full model could save 26% of blood cultures while maintaining a sensitivity of 98.5% (Table 3).Figure 1.Decision curve analysis Conclusion The proposed bacteremia prediction models are designed for easy implementation in electronic patient records and can reduce unnecessary blood cultures. Further external validation is needed before implementation in clinical practice. Disclosures All Authors: No reported disclosures

Prognostic Performance of Sequential Organ Failure Assessment, Acute Physiology and Chronic Health Evaluation III, and Simplified Acute Physiology Score II Scores in Patients with Suspected Infection According to Intensive Care Unit Type.

We investigated the prognostic performance of scoring systems by the intensive care unit (ICU) type. This was a retrospective observational study using data from the Marketplace for Medical Information in the Intensive Care IV database. The primary outcome was in-hospital mortality. We obtained Sequential Organ Failure Assessment (SOFA), Acute Physiology and Chronic Health Evaluation (APACHE) III, and Simplified Acute Physiology Score (SAPS) II scores in each ICU type. Prognostic performance was evaluated with the area under the receiver operating characteristic curve (AUROC) and was compared among ICU types. A total of 29,618 patients were analyzed, and the in-hospital mortality was 12.4%. The overall prognostic performance of APACHE III was significantly higher than those of SOFA and SAPS II (0.807, [95% confidence interval, 0.799-0.814], 0.785 [0.773-0.797], and 0.795 [0.787-0.811], respectively). The prognostic performance of SOFA, APACHE III, and SAPS II scores was significantly different between ICU types. The AUROC ranges of SOFA, APACHE III, and SAPS II were 0.723-0.826, 0.728-0.860, and 0.759-0.819, respectively. The neurosurgical and surgical ICUs had lower prognostic performance than other ICU types. The prognostic performance of scoring systems in patients with suspected infection is significantly different according to ICU type. APACHE III systems have the highest prediction performance. ICU type may be a significant factor in the prognostication.

47 Clinical Approach to Febrile Urinary Tract Infections in Young Children Presenting to the Paediatric Emergency Department: A Retrospective Study of National Guideline Compliance

Abstract Background Antimicrobial resistance is one of the greatest threats to global health. Antibiotic overuse drives antimicrobial resistance. Suspected urinary tract infection (UTI) is a key area of over-prescribing in many clinical settings but has not been investigated in the paediatric emergency department (ED). Objectives Here, we explore compliance with national UTI management guidelines in a paediatric emergency department setting and characterize patient and provider factors associated with guideline non-compliance. Design/Methods We performed retrospective chart review of patients ages 60 days to 36 months, discharged with a diagnosis of UTI from a single, urban, tertiary care paediatric emergency department (PED) with a diagnosis of UTI. Random visits were chosen using a computer algorithm. Primary outcomes were: 1) proportion of patients receiving guideline-compliant investigation and treatment, and 2) the proportion of children whose antibiotic prescriptions were appropriately adjusted upon return of urine culture and antibiotic susceptibilities (C&amp;S). The guideline was the Canadian Paediatric Society statement on management of UTI, as well as the BC Children’s Hospital institutional UTI management guideline. Descriptive statistics and odds ratios between associations were calculated. Results We reviewed 402 charts. The proportion of infants receiving guideline-compliant testing and treatment was 25.9% (95% CI: 21.8-30.4%). Of those who were prescribed antibiotics, 79.6% (95% CI: 74.7-83.8%) received a first-line recommended agent and 58.9% (95% CI: 53.8-63.8%) received fully compliant therapy with respect to agent, dose, duration, and frequency. 19.4% (15.4-24.2%) of patients who were prescribed empiric cephalexin received an inappropriately high total daily dose. The proportion of patients receiving age-appropriate testing method was 52.2% (95% CI: 47.4-57.1). Febrile children were more likely to receive age-appropriate urine sample collection by catheterized sample (OR: 2.77 95% CI: 1.81-4.25) compared with afebrile children. Ultimately, 50.7% (95% CI: 40.4-49.6%) of patients discharged with a diagnosis of UTI and prescription for antibiotic met diagnostic criteria for UTI based on urinalysis and culture results. Of patients whose C&amp;S mandated a change in therapy, 60.8% (95% CI: 55.8-65.7%) had their agent changed or discontinued. Conclusion Paediatric emergency medicine physicians frequently order inappropriate investigation and empiric treatment of UTI in young children. Discontinuation of empiric antibiotics in culture-negative children may be an impactful stewardship intervention in the PED.

1151 The Accuracy and Diagnostic Value of Gram Staining from Joint Aspirates in Suspected Joint Infection

Abstract Aim Septic arthritis is a debilitating pathology. Joint aspirate gram stain is often performed followed by definitive culture. We review the accuracy of gram staining for suspected septic arthritis, and investigate factors associated with aspirate cultures positive for bacterial growth. Method We reviewed all theatre performed joint aspirates at a Major Trauma Centre from 2015-2021 for suspected septic arthritis. Information collected included aspirate-site, gram stain and culture results delay, patient demographics, orthopaedic/rheumatological history of affected joint, and various comorbidities. Outcomes included sensitivity and specificity of the gram stain. Factors that predisposed patients to positive cultures and false-negative gram stains results were calculated via multivariate binary logistic regression. Results A total of 408 joint aspirates were included, of which 37 did not receive initial gram staining. Gram staining and culture results’ delay were on average 1.1 and 5.4 days respectively. Logistic regression revealed that prosthetic joint (p = 0.007), past joint infections (p = 0.006), arthritis (p&amp;lt;0.001), hypertension (p = 0.007), currently smoking (p = 0.019) were positively associated with positive cultures, and past joint infections (p = 0.004) were significantly positively associated with false negative gram stain results. Patients on antibiotics at time of aspirate were at higher risk of false-negative gram stain results (OR = 5.538, 95% CI [2.802-10.948], p&amp;lt;0.001). Conclusions Whilst the initial gram stain is fast, it has poor sensitivity. We recommend caution when lending any weight to a negative result. Moreover, if the comorbidities highlighted are present or the patient is on antibiotics at time of aspirate, hyper-vigilance should be exercised to risk stratifying patients with any clinical hallmarks of joint infection.

Predictors of In-Hospital Mortality in Older Inpatients with Suspected Infection

ObjectivesTo determine the rate and predictors of death in older individuals with suspected infection at any time during hospital stay in a geriatric acute ward and the prognostic ability of different tools [quick Sequential (Sepsis-related) Organ Failure Assessment (qSOFA), Modified and National Early Warning Scores (MEWS) and (NEWS)] in such population. DesignProspective observational single-center cohort study. Setting and ParticipantsAmong patients admitted to an acute geriatric unit of an Italian University Hospital with at least 1 sepsis risk factor, all subjects with suspected infection at admission or during hospital stay (defined as antibiotic prescription and associated culture test) were considered. MethodsA geriatric assessment including comorbidity and social, functional, and cognitive status was performed for each patient. Clinical parameters were evaluated at least twice daily throughout hospital stay; qSOFA, MEWS, and NEWS were derived, with positive cutoffs set at ≥2, ≥5, and ≥7, respectively. ResultsAmong 305 older inpatients (median age 86.0 years, 49.2% female), 21% died during hospital stay. Sepsis was diagnosed in 31.8% of the overall sample and in 64.1% of deceased patients. Deceased patients showed a significantly higher prevalence of prior institutionalization, functional dependence, cognitive impairment, and multimorbidity. The prognostic accuracy of the qSOFA score at infection onset was only fair (area under the receiver operating characteristic curve 0.72; 95% CI, 0.65–0.79, P < .001) and comparable with that of MEWS and NEWS. After multivariable analysis, in-hospital death was positively associated with male sex [odds ratio (OR), 2.11; 95% CI, 1.01–4.44; P = .048] and abnormal white blood cells count (OR, 4.93; 95% CI, 2.36–10.29; P < .001), platelet count (OR, 2.61; 95% CI, 1.10–6.16; P = .029) and serum creatinine (OR, 2.70; 95% CI, 1.30–5.61; P = .008), along with any of the score considered, and negatively associated with autonomy in instrumental activities (OR, 0.78; 95% CI, 0.68–0.90; P < .001). ConclusionsPrognosis in older inpatients with infection or sepsis appears to be determined both by the geriatric characteristics and by the severity of the acute event, expressed by recommended tools and blood test results.

Epidemiological and Clinical Characteristics of Patients Admitted to a Secondary Hospital with Suspected MPOX Virus Infection: Is HIV Playing a Role?

MPOX (monkeypox) is a zoonotic viral disease, endemic in some Central and West African countries. However, in May 2022, cases began to be reported in non-endemic countries, demonstrating community transmission. Since the beginning of the outbreak, different epidemiological and clinical behaviors have been observed. We conducted an observational study at a secondary hospital in Madrid to characterize suspected and confirmed cases of MPOX epidemiologically and clinically. Besides the general descriptive analysis, we compared data between HIV-positive and HIV-negative subjects; 133 patients were evaluated with suspected MPOX, of which 100 were confirmed. Regarding positive cases, 71.0% were HIV positive, and 99.0% were men with a mean age of 33. In the previous year, 97.6% reported having sex with men, 53.6% used apps for sexual encounters, 22.9% practiced chemsex, and 16.7% went to saunas. Inguinal adenopathies were significantly higher in MPOX cases (54.0% vs. 12.1%, p < 0.001), as the involvement of genital and perianal area (57.0% vs. 27.3% and 17.0% vs. 1.0%, p = 0.006 and p = 0.082 respectively). Pustules were the most common skin lesion (45.0%). In HIV-positive cases, only 6.9% had a detectable viral load, and the mean CD4 count was 607.0/mm3. No significant differences were observed in the disease course, except for a greater tendency towards the appearance of perianal lesions. In conclusion, the MPOX 2022 outbreak in our area has been related to sexual intercourse among MSM, with no severe clinical cases nor apparent differences in HIV and non-HIV patients.

Evaluation of Maternal Fetal Outcomes of Pregnant Women and Mothers with Suspected Infection by SARS-CoV-2 Treated at the Municipal Hospital of São Bernardo do Campo (HMU-SBC), Brazil.

The impact of Covid-19 infection on pregnancy and perinatal outcomes is not fully known. To describe the risk factors and perinatal outcome of pregnant women with suspected COVID-19 infection. We evaluated medical records of women with suspected or confirmed SARS-CoV-2 infection who received health care services at the University Hospital of São Bernardo do Campo from March 1 to July 31, 2020, and personal, clinical, and laboratory data of these women and their newborns. Of the 219 women identified, 29% were asymptomatic. Considering the total population, 26% and 17% had obesity and hypertensive syndrome, respectively. Fever measured in the emergency room was the main reason for hospitalization. The presence or not of flu-like symptoms did not impact on perinatal outcomes. Pregnant women requiring hospitalization had newborns with lower birth weight (p < 0.01), shorter length (p = 0.02), and smaller head circumference (p = 0.03), and, in these cases, a higher number of cesarean section deliveries was observed. COVID-19 infection did not affect the prognosis of pregnancy and newborns. However, the worst clinical outcome, requiring hospitalization, had an impact on the anthropometric measurements of newborns.

Early Discontinuation of Antibiotics in Patients Admitted With Clinically Suspected Serious Infection but Negative Cultures: Retrospective Cohort Study of Practice Patterns and Outcomes at 111 US Hospitals.

The optimal duration for antibiotics in patients hospitalized with culture-negative serious infection (CNSI) is unknown. We compared outcomes in patients with CNSI treated with 3 or 4 vs ≥5 days of antibiotics. CNSI was identified among adults admitted to 111 US hospitals between 2009 and 2014 via electronic health record data, defined as suspected serious infection (blood cultures drawn and ≥3 days of antibiotics) and negative culture- and nonculture-based tests for infection. Patients treated with antibiotics on their last hospital day and patients with diagnosis codes for sepsis-mimicking conditions were excluded. Among patients without fevers/hypothermia or vasopressors by day 3, we calculated odds ratios for in-hospital mortality or discharge to hospice associated with 3 or 4 vs ≥5 days of antibiotics, adjusting for confounders. Antibiotics were discontinued in 3 or 4 days in 1862 (9%) of 20 714 patients with CNSI. Early discontinuation was not associated with higher mortality odds overall (adjusted odds ratio [aOR], 1.27; 95% CI, .98-1.65), in patients presenting with (1.39; .88-2.22) and without sepsis (1.17; .81-1.69), and in those with pulmonary (1.23; .65-2.34) and nonpulmonary CNSI (1.30; .99-1.72). Early discontinuation appeared detrimental with propensity score weighting (aOR, 1.36; 95% CI, 1.03-1.80) and when retaining patients with sepsis mimics (1.38; 1.16-1.65), but it was protective (0.48; .37-.64]) when retaining patients who received antibiotics on their last hospital day. Early discontinuation of antibiotics in CNSI was not associated with significant harm in our primary analysis, but different conclusions based on alternative analytic decisions, as well as risk of residual confounding, indicate that randomized controlled trials are needed.