Public Health Threat Research Articles

Perceptions of patients and healthcare providers regarding barriers and enablers of HIV anti-retroviral therapy among women at a regional hospital in Ghana: implications for national HIV/AIDS control

BackgroundThe Acquired Immune Deficiency Syndrome (AIDS) pandemic has created a lot of devastation over the last four decades and continues to be a public health threat. Anti-retroviral treatment (ART), a group of medications that people who have been diagnosed with the Human Immunodeficiency Virus (HIV) infection take, has been shown to be efficacious and has significantly improved the fight against the disease. In Ghana, women carry a higher prevalence and incidence of HIV. The study’s objectives were to understand the experiences of women living with HIV/AIDS on ART and determine the barriers and enablers for ART uptake from the perspective of both the females living with HIV and their healthcare providers in the Upper East Regional Hospital of Ghana.MethodsThis was a qualitative study that used interviews to acquire data from women living with HIV on the perceived barriers and enablers for ART. The Upper East Regional Hospital in Ghana was the study site. We used a phenomenological approach to explore the lived experiences, perceptions, and meanings associated with ART among women. We collected data until we reached thematic saturation, interviewing a total of sixteen women living with HIV. We conducted a focus group discussion with nine healthcare workers providing care at the ART clinic. Data were analysed using thematic analysis.ResultsWomen living with HIV and their healthcare providers viewed an environment that provided encouragement and support from healthcare workers and patients’ relatives, the ability to conceal HIV status, peer counselling, and the perceived benefits of therapy as enablers of ART uptake and medication adherence. The following were barriers to ART uptake and adherence: ill health, forgetfulness, long distances to ART clinics, cultural and spiritual beliefs, and fear of stigma.ConclusionsEnablers of ART uptake should be expanded upon and encouraged so that women living with HIV/AIDS can access drugs in a timely and stress-free manner. On the other hand, the barriers identified can be addressed through education, the expansion of healthcare infrastructure, and the economic empowerment of women.

Effectiveness of mass trapping interventions using autocidal gravid ovitraps (AGO) for the control of the dengue vector, Aedes (Stegomyia) aegypti, in Northern Mexico

BackgroundMosquito-borne diseases, such as malaria, dengue, Zika and chikungunya, pose significant public health threats in tropical and subtropical regions worldwide. To mitigate the impact of these diseases on human health, effective vector surveillance and control strategies are necessary. Traditional vector control methods, which rely on chemical agents such as insecticides and larvicides, face challenges such as resistance and environmental concerns. Consequently, there has been a push to explore novel surveillance and control tools. Mass trapping interventions have emerged as a promising and environmentally friendly approach to reducing the burden of mosquito-borne diseases. This study assessed mass-trapping interventions using autocidal gravid ovitraps (AGOs) on Aedes aegypti populations in Reynosa, Tamaulipas, Mexico.MethodsFour neighborhoods were selected to evaluate the effects of three treatments: AGO mass-trapping, integrated vector control (IVC), which included source reduction and the application of chemical larvicide and adulticide, and AGO + IVC on Ae. aegypti populations. A control area with no interventions was also included.The effectiveness of the interventions was evaluated by comparing Ae. aegypti abundance between the pre-treatment period (9 weeks) and the post-treatment period (11 weeks) for each treatment.ResultsOnly treatment using AGO mass trapping with an 84% coverage significantly reduced Ae. aegypti female populations by 47%, from 3.75 ± 0.32 to 1.96 ± 0.15 females/trap/week. As expected, the abundance of Ae. aegypti in the control area did not differ from the pre- and post-treatment period (range of 4.97 ± 0.59 to 5.78 ± 0.53); Ae. aegypti abundance in the IVC treatment was 3.47 ± 0.30 before and 4.13 ± 0.35 after, which was not significantly different. However, Ae. aegypti abundance in the AGO + IVC treatment increased from 1.43 ± 0.21 before to 2.11 ± 0.20 after interventions; this increase may be explained in part by the low AGO (56%) coverage.ConclusionsThis is the first report to our knowledge on the effectiveness of mass-trapping interventions with AGOs in Mexico, establishing AGOs as a potential tool for controlling Ae. aegypti in Northeastern Mexico when deployed with sufficient coverage.Graphical

Interactive and lag effects of environmental factors on the density of schistosome-transmitting Oncomelania hupensis: A twelve-year monthly repeated survey.

Schistosomiasis is a significant public health threat, and Oncomelania hupensis is the only intermediate host for schistosoma japonicum. We conducted 12-year monthly repeated surveys to explore the interactive and lag effects of environmental factors on snail density and to monitor their long-term and seasonal trends in a bottomland around the Dongting Lake region in China. Relevant environmental data were obtained from multiple sources. A Bayesian kernel machine regression model and a Bayesian temporal model combined with a distributed lag model were constructed to analyze interactive and lag effects of environmental factors on snail density. The results indicated the average annual snail density in the study site exhibited an increasing and then decreasing trend, peaking in 2013. Snail densities were the highest in October and the lowest in January in a year. Normalized Difference Vegetation Index (NDVI) and water level were the most effective predictors of snail density, with potential interactions among temperature, precipitation, and NDVI. The mean minimum temperature in January, water level, precipitation and NDVI were positively correlated with snail density at lags ranging from 1 to 4 months. These findings could serve as references for relevant authorities to monitor the changing trend of snail density and implement control measures, thereby reducing the occurrence of schistosomiasis.

Platelet Ido1 expression is induced during Plasmodium yoelii infection, altering plasma tryptophan metabolites

AbstractPlatelets are immune responsive in many diseases as noted by changes in platelet messenger RNA in conditions such as sepsis, atherosclerosis, COVID-19, and many other inflammatory and infectious etiologies. The malaria causing Plasmodium parasite is a persistent public health threat and significant evidence shows that platelets participate in host responses to infection. Using a mouse model of nonlethal/uncomplicated malaria, Plasmodium yoelii XNL (PyNL)-infected but not control mouse platelets expressed Ido1, a rate limiting enzyme in tryptophan metabolism that increases kynurenine at the expense of serotonin. Interferon-γ (IFN-γ) is a potent inducer of Ido1 and mice treated with recombinant IFN-γ had increased platelet Ido1 and IDO1 activity. PyNL-infected mice treated with anti-IFN-γ antibody had similar platelet Ido1 and metabolic profiles to that of uninfected controls. PyNL-infected mice become thrombocytopenic by day 7 after infection and transfusion of platelets from IFN-γ–treated wild-type mice but not Ido1−/− mice increased the plasma kynurenine-to-tryptophan ratio, indicating that platelets are a source of postinfection IDO1 activity. We generated platelet-specific Ido1 knockout mice to assess the contribution of platelet Ido1 during PyNL infection. Platelet-specific Ido1−/− mice had increased death and evidence of lung thrombi, which were not present in infected wild-type mice. Platelet Ido1 may be a significant contributor to plasma kynurenine in IFN-γ-driven immune processes and the loss of platelets may limit total Ido1, leading to immune and vascular dysfunction.

Assessment of Knowledge, Attitude, and Practice of Hand Hygiene Among Medical Students in a Tertiary Care Hospital.

Healthcare-associated infections (HCAIs) and emerging multi-drug resistance in nosocomial pathogens are perceived as a serious public health threat. Hands of healthcare workers (HCWs) become routinely colonized during patient care, serving as vehicles for transmission and leading to HCAIs.Hand hygiene (HH) is a globally accepted tool to avoid the broadcast of dangerous microorganisms and prevent HCAIs. A cross-sectional study was carried out to evaluate the knowledge, attitude, and practice toward HH among the medical students at Saveetha Medical College, Chennai, India. A 25-item validated questionnaire survey was formulated and circulated to100 medical students of all four academic years. There were 100 responses to the survey, and 44 (44%) participants performed HH appropriately for 20 seconds with alcohol-based hand rub. In our study, 25％ of the participants revealed that HH practices were not followed during emergencies. Many participants (40%) stated that the lack of sink, soaps, alcohol-based sanitizers, paper towels, and water is the reason for not performing HH. The gross knowledge of HH of the participants is moderate, but there were gaps between the knowledge and practice. Hence, it is essential to conduct structured training sessions and surveillance programs for medical students to address these gaps in knowledge and the correct HH procedures.

Sugar-Sweetened Beverages and Diet Related Chronic Non-Communicable Diseases in Sub-Saharan Africa

abstract In Sub-Saharan Africa (SSA), diet-related chronic non-communicable diseases (DR-CNCDs) pose a growing public health threat, jeopardising progress towards achieving Sustainable Development Goal 3.4. One contributing factor to this rising threat is the recent surge in consumption of sugar-sweetened beverages (SSBs), across SSA in recent years. Using the socio-ecological model, this commentary explores the nexus between DR-NCDs and SSBs and offers interventions to address this public health challenge at the individual, interpersonal, community, organisational and policy levels. At the individual level, health education campaigns should target individuals and ensure an increase in awareness creation. The life-course approach underscores the importance of promoting healthier dietary choices from childhood to prevent diet-related non-communicable diseases in later life. Schools and workplaces enforcing local policies that discourage SSB consumption patterns will make a huge difference at the community and organisational levels. At the societal/policy level, comprehensive strategies such as sugar taxes, front-of-pack labelling, advertising restrictions and health education programmes are crucial.

Post-marketing quality surveillance of selected antibacterial agents marketed in porous borders; the case of Ethiopia-Sudan-Eritrea border.

The presence of poor-quality medicines is becoming a public health threat in many parts of the world, particularly in developing countries. Antibiotics are among the most common anti-infective medicines that are highly prone to this problem. The purpose of this study was to assess the quality of selected antibacterials that are marketed in Setit Humera and West Gondar Zones, North West Ethiopia, which are located on the Ethiopian side of the Ethiopia-Sudan-Eritrea border. Seventy-one samples of the four antibacterial medicines (Ciprofloxacin, Norfloxacin, Amoxycillin, and Amoxycillin clavullanate combination) were collected from six sites in Setit Humera and West Gondar Zones, North West Ethiopia. A mystery shopping system was used for sample collection. Visual inspections and confirmation of the registration status were carried out using the joint WHO/FIP/USP checklist and the Ethiopian Food and Drug Authority's (EFDA's) Electronic Regulatory Information System (eRIS), respectively. Then Pharmacopeial methods (USP, BP) were employed to assess the physicochemical quality parameters. During the period of our data collection, the application status for registration in the eRIS system was checked. From 71 samples, 25.35% (18/71) were not registered, and 15.49% (11/71) were registered, but the license period had expired. Some samples (12.06% (17/71)) did not meet the visual inspection criteria. The physicochemical evaluation showed that all the samples studied met the quality specifications for the identification and hardness tests. However, concerning assay, dissolution, uniformity of dosage units, disintegration, and friability test parameters, 27.49% (23/71), 16.9% (12/71), and 14.08% (10/71), 2.82% (2/71) and 8.57% (3/35) of samples were found to be substandard, respectively. Overall, 56.33% (40/71) of the samples tested were of poor quality, failing to meet any one or more of the assessed parameters in this study. The study indicated that poor-quality antibacterial medicines are circulating in the study sites. Therefore, even if the area was affected by conflict at the time of the study, the regulatory bodies should focus on enforcing the necessary measures by collaborating with the regional and national regulatory medicine agencies to ensure that the antibacterial medicines available meet the required mandatory minimum standards.

Hepatitis C Elimination in Egypt: Story of Success.

Egypt has long been overwhelmed by the hepatitis C virus (HCV) infection, and it used to be the country with the world's highest prevalence rates. The disease had been a significant public health problem, affecting millions of Egyptians and posing severe economic and social challenges. By the early 2000s, it was estimated that around 10% of the Egyptian population was infected with HCV. However, in recent years, with the availability of direct-acting antiviral therapies, the country has made enormous steps in combating this public health threat. The combination of innovative health strategies and political will enabled Egypt to establish a successful model of care for HCV management and to be the first country to eliminate hepatitis C, setting a model for the rest of the world. In 2023, Egypt became the first country to fulfill the World Health Organization's set programmatic criteria of reduction of hepatitis C incidence and mortalities to levels close to elimination of disease or achieve the "gold tier" status on the path to disease elimination.

Development and Application of Colloidal Gold Test Strips for the Rapid Detection of Canine Brucellosis.

Brucellosis is a global problem, with the causative agent being the genus Brucella. B. canis can cause undulant fever in dogs, which is a zoonotic disease that can spread not only among dogs but also to humans. This poses a public health threat to society. In this study, a rapid and straightforward immune colloidal gold test strip was developed for the diagnosis of canine brucellosis through the detection of anti-LPS antibodies in serum samples. Rabbit anti-canine IgG conjugated with colloidal gold was employed as the colloidal gold-labeled antibody. The extracted high-purity R-LPS was employed as the capture antigen in the test line (T-line), while goat anti-rabbit IgG was utilized as the capture antibody in the control line (C-line). The colloidal gold strip exhibited high specificity in the detection of brucellosis, with no cross-reaction observed with the common clinical canine diseases caused by Canine coronavirus (CCV), Canine distemper virus (CDV), and Canine parvovirus (CPV). In comparison to the commercial iELISA kit, the sensitivity and specificity of the colloidal gold test strip were found to be 95.23% and 98.76%, respectively. The diagnostic coincidence rate was 98.47%. The findings of this study indicate that colloidal gold test strips may be employed as a straightforward, expeditious, sensitive, and specific diagnostic instrument for the identification of canine brucellosis, particularly in resource-limited regions.

(Invited) Norfentanyl Detection with Carbon Nanotube-Based Field-Effect Transistors

The opioid crisis, propelled predominantly by synthetic opioids such as illicit fentanyl, constitutes a significant global public health threat. To meet the critical demand for a sensitive and portable analytical tool for detecting fentanyl exposure, we have developed two types of biosensors based on single-walled carbon nanotubes (SWCNTs).The first biosensor is a field-effect transistor (FET) device with semiconductor-enriched SWCNTs, functionalized with norfentanyl antibody.1 This antibody-SWCNT-FET biosensor exhibits ultrasensitive detection of norfentanyl, the primary inactive metabolite of fentanyl, in urine samples. Various sensor configurations were investigated to optimize sensing results. The use of a "reduced" antibody facilitated oriented immobilization, enhancing the proximity of the antigen-antibody interaction to the sensor surface and resulting in improved sensitivity. These norfentanyl biosensors demonstrate remarkable sensitivity, with a limit of detection in the fg/mL range in both calibration and synthetic urine samples, showcasing their potential as highly reliable detection tools.While capture probes like antibodies enhance chemical sensitivity and selectivity, the stability of nanotube-based biosensors is constrained by the activity of these capture probes. To address this limitation, we have explored an alternative approach involving sensor arrays consisting of different metal-organic frameworks (MOFs) on SWCNTs, which act as nonspecific receptors. With the assistance of machine learning-driven discrimination, such sensor arrays hold the potential to generate unique signals for different analytes.In pursuit of this objective, size-based norfentanyl detection was achieved using SWCNT@MOF composites in FET biosensors.2 Four SWCNT@MOF composites were synthesized, with SWCNT@UiO-67 demonstrating the highest sensing response to norfentanyl due to a size-matching effect within the MOF channel. Composites with smaller pore sizes such as SWCNT@UiO-66 and SWCNT@UiO-66-NH2 did not exhibit sensitivity improvement compared to bare SWCNT. We have also demonstrated selectivity of these biosensors for norfentanyl over norhydrocodone and benzoylecgonine, which are major metabolites of hydrocodone and cocaine, respectively.Moreover, we successfully applied our sensor fabrication with a flexible FET electrode and a portable sensing setup, showing significant potential for developing a portable device for on-site detection of fentanyl exposure with improved sensitivity. Therefore, we envision our norfentanyl biosensors can enhance the safety and security of both first responders and overdose victims and provide a platform technology that can contribute to the development of effective tools for addressing the opioid crisis.[1] Shao, W.; Zeng, Z.; Star A., An Ultrasensitive Norfentanyl Sensor Based on a Carbon Nanotube-Based Field-Effect Transistor for the Detection of Fentanyl Exposure. ACS Appl. Mater. Interfaces 2023, 15, 37784–37793.[2] Zeng, Z.; Islamov, M.; He, Y.; Day, B. A.; Rosi, N. L.; Wilmer, C. E.; Star, A., Size-Based Norfentanyl Detection with SWCNT @ UiO-MOF Composites. ACS Appl. Mater. Interfaces 2023, accepted.

Antibacterial Resistance and Extended-Spectrum Beta-Lactamase (ESBL) Phenotypes in Enterobacteriaceae Isolated from Fecal Samples of Humans and Animals in Selected Local Government Areas of Nasarawa State, Nigeria

It is quite alarming the increasing rate of antibacterial resistance all over the world considering the public health threat and the re-emergence of multi-drug resistant Enterobacteriaceae. The aim of this study is Antibacterial resistance and phenotypic detection of Extended Spectrum Beta-Lactamase (ESBL) producing Enterobacteriaceae isolated from human and animal fecal samples in selected local government areas of Nasarawa state, Nigeria was carried out in the study. Hundred (100) samples comprising human and animal (goats, cattle, and chicken) were collected and 55 samples were multidrug resistant. A commercial biochemical kit (Eneterosystem 18R) was used for the isolation and identification of Enterobacteriaceae. Kirby Bauer Disk Diffusion Method was used for antibacterial susceptibility testing of Enterobacteriaceae isolates. The Double Disc Synergy Test (DDST) method was also used for the phenotypic confirmation test of Extended Spectrum Beta Lactamase (ESBL). The occurrence of multidrug-resistant isolates shows that Escherichia coli (100.00%) which is the highest, Proteus mirabilis (14.54%), Klebsiella pneumoniae, and Salmonella enterica (10.90%), while the occurrence of Shigella flexneri (9.09%) was the lowest. The Enterobacteriaceae isolates were more resistant to Cefuroxime, Cefexime, Amoxicillin Clavulanate, and Imipenem/Cilastatin with percentage resistance ranges from 66.6% - 100%. The occurrence of ESBL producers shows that Escherichia coli (60.00%) and Proteus mirabilis (62.5%) were high while Shigella flexneri (20.0%) had a low occurrence of ESBL. The sale and in-discriminate use of antibiotics without a prescription is an important regulatory issue in the abuse of antibiotics for both humans and animals. The Beta-Lactam and gentamycin antibiotics were not effective against the Multi-Drug Resistant (MDR) isolates and most of the isolates were ESBL producers.

Impact of COVID-19 and Mpox on Sexual Practices and Disease Mitigation Strategies Over Time among Men who Have Sex with Men Affiliated with Collective Sex Venues.

The COVID-19 pandemic and subsequent multi-national mpox outbreak significantly disrupted sexual health care delivery, particularly impacting men who have sex with men (MSM). This study investigated these public health emergencies in relation to perceptions, attitudes, and sexual practices among MSM affiliated with a collective sex venue (CSV). Electronic surveys were sent to clientele of a high-volume CSV between June 2021 and November 2022 across three time periods defined as pre-Omicron, post-Omicron, and mpox. Data collection encompassed sociodemographics, healthcare access, STI/HIV status, COVID-19 testing, and sexual behaviors. Multivariable regression analyses identified factors associated with self-reported COVID-19 testing and positivity, and mpox exposure. Among 1,135 responses, demographics were largely cisgender MSM and predominantly White. Increased self-reported COVID-19 positivity was associated with having more sex partners and frequenting bathhouses for meeting sex partners. Confidence in COVID-19 mitigation strategies decreased post-Omicron. Factors linked to mpox exposure included younger age, increased sex partners, STI positivity, and lower confidence in mitigation strategies. These findings underscore the intersectionality between sexual behaviors and public health responses to COVID-19 and mpox among MSM communities affiliated with a CSV. Decreased confidence in mitigation strategies and changes in sexual behaviors during public health emergencies underscore the need for targeted interventions and messaging. Collaboration between health departments and CSVs can facilitate responses to current and future public health threats and interventions.

Dengue Fever: A Public Health Threat to Bangladesh

Dengue fever has become a significant health concern in Bangladesh, with a substantial number of reported cases in recent years. This mosquito-borne viral infection is caused by the dengue virus, transmitted by the Aedes mosquito. The effects of dengue fever can range from mild symptoms such as high fever, muscle and joint pains, to severe complications that can be life-threatening. This paper aims to provide an update on the current situation of dengue fever in Bangladesh, the measures taken by the government and healthcare systems, and the challenges faced in controlling the spread of this disease. In recent years, Bangladesh has experienced a surge in dengue fever cases, particularly during the monsoon season when mosquitoes thrive. According to the Directorate General of Health Services (DGHS), the number of dengue cases has been increasing rapidly, with thousands of reported cases each year. The densely populated urban areas of Dhaka, the capital city, are particularly affected, as inadequate waste management and sanitation contribute to the breeding grounds for mosquitoes. The impact of dengue fever extends beyond health, as it also poses a significant economic burden on affected individuals and the healthcare system. To combat the spread of dengue fever, the government of Bangladesh has taken several measures. These include implementing public awareness campaigns to educate the population about the importance of mosquito control, encouraging practices such as removing standing water and using mosquito repellents, and promoting early diagnosis and treatment. The government has also strengthened its vector control and surveillance programs, focusing on increased mosquito control measures and the early detection of cases. Additionally, efforts have been made to improve healthcare infrastructure and capacity to handle the growing number of dengue cases. However, despite these efforts, challenges remain in controlling the spread of dengue fever in Bangladesh. Factors such as limited resources, inadequate urban planning, and a lack of community participation continue to hinder progress. Furthermore, the emergence of new strains of the dengue virus and the potential for future outbreaks make it crucial to continuously monitor and adapt control strategies. Collaborative efforts between the government, healthcare systems, and the community are essential to effectively manage and prevent the spread of dengue fever in Bangladesh. Only through a comprehensive and sustained approach can the country hope to combat this public health threat effectively. CBMJ 2024 July: vol. 13 no. 02 P: 282-289

Persistence of Salmonella and Campylobacter on Whole Chicken Carcasses under the Different Chlorine Concentrations Used in the Chill Tank of Processing Plants in Sri Lanka.

The persistence of non-typhoidal Salmonella and Campylobacter in chicken meat is a considerable public health risk and a future challenge. This study aimed to determine the prevalence of Salmonella and Campylobacter in poultry processing lines where different chlorine concentrations were used in the chill tank. The samples were collected from four types of processing plants in Sri Lanka, considering the chlorine concentration used in the chill tank, which ranged from 2 ppm to 50 ppm. Salmonella and Campylobacter were isolated from whole carcass washings, neck skin, and cecal samples. Subsequently, an antimicrobial susceptibility test was performed for the isolates. The results revealed the overall prevalence of Salmonella and Campylobacter was 78.25% and 63.5%, respectively. Positive percentages of Salmonella and Campylobacter were high in the carcasses compared to the neck skin and ceca. The Campylobacter counts on the whole carcasses were significantly low (p < 0.001), at higher chlorine concentrations ranging from 20 to 30 ppm and 40 to 50 ppm. The pathogen prevalence in the whole carcasses was 84.7% Campylobacter coli, 39.1% Campylobacter jejuni, 71.1% Salmonella Typhimurium, and 28.8% Salmonella Infantis. The highest resistance was observed for tetracycline (63.8%) in Salmonella, while it was for gentamicin (87.8%) in Campylobacter. The prevalence percentage of multidrug-resistant Campylobacter was 51.2%, while it was 2.12% for Salmonella. The persistence of multidrug-resistant Salmonella and Campylobacter on the post-chill carcasses was highlighted in the present study as a significant public health threat that has to be addressed urgently.

Effect of 10-week Isometric handgrip exercise at home on hemodynamic and psychological factors of sedentary hypertensive women during COVID-19

Background and Objective: COVID-19 poses significant public health threats and impacts physical activity, particularly in hypertensive patients. The aim of this study is to examine the ten weeks of isometric handgrip exercise impact on hypertensive women during quarantine. Methods: thirty female volunteers with high blood pressure participated in this randomized controlled trial study. The isometric handgrip (IHG) exercise group performed the exercise for ten weeks (3 sessions per week, 4x2 min isometric contractions at 30% MVC, separated by 2 minutes rest) via video call at home, and the control group had no exercise program. The blood pressure (systolic, diastolic, and mean), heart rate, and myocardial oxygen consumption were measured before and after exercise program; DASS21 and quality of life (Sf-36) questionnaires were then completed by the participants. Results: Systolic, diastolic, and mean blood pressure showed a significant decrease (5 mmHg, 2 mmHg, respectively); quality of life and DASS21 scores showed a significant improvement after IHG exercise compared to the control (p &lt; .05). Conclusion: IHG exercise activity at home is highly effective and useful for improving blood pressure and quality of life of hypertensive women, and it is also a treatment option to reduce stress, depression and anxiety due to COVID-19.

Cyclization increases bactericidal activity of arginine-rich cationic cell-penetrating peptide for Neisseria gonorrhoeae.

We previously reported that a linear cationic 12-amino acid cell-penetrating peptide (CPP) was bactericidal for Neisseria gonorrhoeae. In this study, our objectives were to determine the effect of cyclization of the linear CPP on its antibacterial activity for N. gonorrhoeae and cytotoxicity for human cells. We compared the bactericidal effect of 4-hour treatment with the linear CPP to that of CPPs cyclized by a thioether or a disulfide bond on human challenge and multi-drug resistant (MDR) strains of N. gonorrhoeae grown in cell culture media with 10% fetal bovine serum (FBS). The effect of lipooligosaccharide (LOS) sialylation on bactericidal activity was analyzed. We determined the ability of the CPPs to treat human cells infected in vitro with N. gonorrhoeae, to reduce the inflammatory response of human monocytic cells to gonococci, to kill strains of three commensal Neisseria species, and to inhibit gonococcal biofilms. The cyclized CPPs killed 100% of gonococci from all strains at 100 µM and >90% at 20 µM and were more potent than the linear form. The thioether-linked but not the disulfide-linked CPP was less cytotoxic for human cervical cells compared to the linear CPP. LOS sialylation had minimal effect on bactericidal activity. In treating infected human cells, the thioether-linked CPP at 20 µM killed >60% of extra- and intracellular bacteria and reduced TNF-α expression by THP-1 cells. The potency of the CPPs for the pathogenic and the commensal Neisseria was similar. The thioether-linked CPP partially eradicated gonococcal biofilms. Future studies will focus on determining efficacy in the female mouse model of gonorrhea.IMPORTANCENeisseria gonorrhoeae remains a major cause of sexually transmitted infections with 82 million cases worldwide in 2020, and 710,151 confirmed cases in the US in 2021, up 25% from 2017. N. gonorrhoeae can infect multiple tissues including the urethra, cervix, rectum, pharynx, and conjunctiva. The most serious sequelae are suffered by infected women as gonococci ascend to the upper reproductive tract and cause pelvic inflammatory disease, chronic pelvic pain, and infertility in 10%-20% of women. Control of gonococcal infection is widely recognized as increasingly challenging due to the lack of any vaccine. N. gonorrhoeae has quickly developed resistance to all but one class of antibiotics and the emergence of multidrug-resistant strains could result in untreatable infections. As such, gonorrhea is classified by the Center for Disease Control (CDC) as an urgent public health threat. The research presented herein on new therapeutics for gonorrhea has identified a cyclic cell-penetrating peptide (CPP) as a potent molecule targeting N. gonorrhoeae.

Soybean extract inhibits influenza virus entry: Mechanistic insights.

Influenza viruses pose significant public health threats because they can cause seasonal outbreaks and global pandemics. Current preventive measures, including vaccines and antiviral drugs, are limited by their low efficacy and the emergence of drug-resistant viruses. Addressing these issues necessitates the development of novel preventive and treatment methods. Our previous work highlighted the inhibitory effects of soybean hydrothermal extract on influenza virus growth. In this study, we aimed to delve into the mechanism underlying the antiviral activity, specifically the inhibition of viral entry. Our findings reveal that soybean extract significantly inhibited the stages of viral entry during a viral infection and hindered virus uptake by cells. Fluorescence microscopy of stained viral nucleoproteins demonstrated viral localization on the cell membrane in soybean-treated cells, highlighting a distinctive pattern compared to the control cells where the virus was internalized. Soybean extract targeted the clathrin-dependent endocytosis pathway, as evidenced by 76% inhibition using a clathrin-dependent marker (transferrin). The identification of soybean inhibitors underscores the need for further investigation and offers potential for innovative antiviral interventions.

Enhanced event-based surveillance: Epidemic Intelligence from Open Sources (EIOS) during FIFA World Cup 2022 Qatar

BackgroundPublic health threats can significantly impact mass gatherings and enhancing surveillance systems would thus be crucial. Epidemic Intelligence from Open Sources (EIOS) was introduced to Qatar to complement the existing surveillance measures in preparation to the FIFA World Cup Qatar 2022 (FWC22). This study estimated the empirical probability of EIOS detecting signals of public health relevance. It also looked at the factors responsible for discerning a moderate-high risk signal during a mass gathering event. MethodsThis cross-sectional descriptive study used data collected between November 8th and December 25th, 2022, through an EIOS dashboard that filtered open-source articles using specific keywords. Triage criteria and scoring scheme were developed to capture signals and these were maintained in MS Excel. EIOS’ contribution to epidemic intelligence was assessed by the empirical probability estimation of relevant public health signals. Chi-squared tests of independence were performed to check for associations between various hazard categories and other independent variables. A multivariate logistic regression evaluated the predictors of moderate-high risk signals that required prompt action. ResultsThe probability of EIOS capturing a signal relevant to public health was estimated at 0.85 % (95 % confidence interval (CI) [0.82 %−0.88 %]) with three signals requiring a national response. The hazard category of the signal had significant association to the region of occurrence (χ2 (5, N = 2543) = 1021.6, p < .001). The hazard category also showed significant association to its detection during matchdays of the tournament (χ2 (5, N = 2543) = 11.2, p < .05). The triage criteria developed was able to discern between low and moderate-high risk signals with an acceptable discrimination (Area Under the Curve=0.79). ConclusionEIOS proved useful in the early warning of public health threats.

Proportions and Seasonal Patterns of Respiratory Viruses via Rapid Tests in Adults at a Greek Hospital (Oct. 2023-Mar. 2024).

Respiratory infections pose a major public health threat. The predominant viruses causing viral respiratory infections are influenza A and B (Flu-A, Flu-B), coronaviruses, respiratory syncytial virus (RSV), and adenovirus. This study aims to investigate the proportion of these cases via rapid antigen tests and assess seasonal patterns. Clinical samples were collected from symptomatic adults presenting to the Emergency and Respiratory Medicine Departments of the University Hospital of Larissa (UHL), Greece from 16 October 2023 to 31 March 2024. Nasal specimens were antigen-tested for Flu-A/B, SARS-CoV-2, RSV, and adenovirus. The total sample of specimens collected was 1434, of which 739 (51.5%) were female and 695 were male (48.5%). The mean age of participants was 57 ± 5.5 years. Among the positive results, we recorded a proportion of 40.18% and 11.40% for influenza A and B, respectively, followed by 35.79% for SARS-CoV-2, 10.70% for RSV, and 1.93% for adenovirus. In Greece, surveillance systems in infection control are underutilized. Rapid tests via multiple antigens can quickly identify viral infections, making them a valuable tool with financial benefits for health systems. Early detection of respiratory infections helps allocate resources efficiently, ensures adequate staff and facilities are available, and improves patient care through refined clinical management.

Genomics for Arbovirus Surveillance: Considerations for Routine Use in Public Health Laboratories.

The emergence and re-emergence of arthropod-borne viruses is a public health threat. For routine surveillance in public health laboratories, cost-effective and reproducible methods are essential. In this review, we address the technical considerations of high-throughput sequencing methods (HTS) for arbovirus surveillance in national health laboratories, focusing on pre-sequencing, sequencing, and post-sequencing approaches, underlining the importance of robust wet and dry laboratory workflows for reproducible analysis. We aim to provide insights for researchers and clinicians interested in arbovirus, diagnosis, and surveillance by discussing current advances in sequencing methods and bioinformatics pipelines applied to arboviruses.