Role In Epidemiology Research Articles

Genomic diversity and transmission patterns of Yersinia pestis in Inner Mongolia Autonomous Region, China

According to WHO, plague, caused by Yersinia pestis, has resurged since 2000. Inner Mongolia, harboring a quarter of China’s plague foci, has accounted for 80% of national plague cases in the past five years. Despite its pivotal role in Chinese plague epidemiology, the genetic diversity and transmission dynamics of Y. pestis in this region remain under-investigated. Our analysis of 585 Y. pestis strains from Inner Mongolia (1948–2021) revealed three primary lineages, with 2.MED3 being predominant. We further delineated seven sub-phylogroups in 2.MED3, with 2.MED3.1.2 and 2.MED3.1.4 showing recent dominance. These two subgroups reveal dual transmission patterns: localized short-distance spread and long-distance dispersals over 300 km. Xilingol League is highlighted as a key source and reservoir for Y. pestis, predominantly spreading from central-eastern to southwestern Inner Mongolia, including occasional reverse transmissions. These findings enhance understanding of Y. pestis diversity and transmission in Inner Mongolia, aiding in enhanced surveillance and control measures.

Optimizing spatial distribution of wastewater-based disease surveillance to advance health equity

In 2022, the US Centers for Disease Control and Prevention commissioned the National Academies of Sciences, Engineering, and Medicine to assess the role of community-level wastewater-based epidemiology (WBE) beyond COVID-19. WBE is recognized as a promising mechanism for promptly identifying infectious diseases, including COVID-19 and other novel pathogens. An important conclusion from this initiative is the critical importance of maintaining equity and expanding access to fully realize the benefits of wastewater surveillance for marginalized communities. To address this need, we propose an optimization framework that strategically allocates wastewater monitoring resources at the wastewater treatment plant (WWTP) level, ensuring more effective and equitable distribution of surveillance efforts to serve underserved populations.The purpose of the framework is to obtain a balanced spatial distribution, inclusive population coverage, and efficient representation of disadvantaged groups in the allocation of resources for WBE. Furthermore, the framework concentrates on areas with high population density and gives priority to vulnerable regions, as well as identifying signals that display significant variations from other monitored sources. The optimization objective is to maximize a weighted combination of these critical factors. This problem is formulated as an integer optimization problem and solved using simulated annealing. We evaluate various scenarios, considering different weighting factors, to optimize the allocation of WWTPs with monitoring systems. This optimization framework provides an opportunity to enhance WBE by providing customized monitoring strategies created to address specific priorities and situations, thus enhancing the decision-making processes in public health responses.

7.I. Skills building seminar: Beyond the jargon: an interactive workshop for effective risk communication

Abstract Risk communication plays a central role in epidemiology to provide information for disease surveillance and outbreak control. It is one of the of the eight core functions that WHO Member States must comply with as part of the International Health Regulations (2005) ensuring national and global preparedness for health threats. It refers to the timely and accurate exchange of information between public health experts or authorities and individuals who are confronted with a threat to their survival, health, economic or social well-being. At its core, risk communication is about empowering people exposed to a risk to make well-informed decisions in order to mitigate potential risks and adopt preventive actions and measures. Risk communication considers political, social, and economic factors; it analyses risk and risk perception; and it places a great emphasis on dialogue with impacted and targeted populations to help them make the best decisions they can. Therefore, it requires an understanding of stakeholders’ perceptions, concerns, and beliefs, as well as their knowledge and practices. In the context of the COVID-19 pandemic, the need for effective and efficient risk communication has become even more evident than before. Risk communication should be able to recognise and deal with rumours and disinformation, and reach the most vulnerable groups, who have a higher risk of contracting the virus and suffering from COVID-related consequences. Lately, increasing attention has been given to this topic. The WHO set-up, in April 2023, a technical Advisory Group for Risk Communication, Community Engagement and Infodemic management (TAG-RCCE-IM) to provide independent review and technical advice in the context of emergency preparedness and response in Europe. The Joint Action PreventNCD aims to also build a framework for country-specific communication strategies for non-communicable diseases (NCD) patients in health crises in one of the Work Packages, by collecting and analysing health communication strategies in different European countries targeting NCDs. In this interactive skills-building seminar, we will share with the participants the knowledge, skills, and process of effective risk communication by using case studies from experts in the field. The session will start with a presentation on the core elements of risk communication followed by examples from the field. This workshop will foster an inclusive interactive environment where participants will hear from panellists sharing their experiences from different settings such as international organisations and national public health institutes. Participants will be split into groups and will be provided with a piece of scientific output, such as a research study or epidemiological report and encouraged to translate this technical message into a clear, concise message that can effectively communicate the key points to the general public. Key messages • Risk communication is essential to fight disinformation while empowering the public to make informed decisions related to their health and well-being. • Epidemiologists and researchers should be encouraged to employ efficient and targeted communication strategies when disseminating their findings. Speakers/Panelists Stefan Schaub Bundeszentrale für gesundheitliche Aufklärung (BZgA, Cologne, Germany Federica Rossetti Sciensano, Brussels, Belgium Stefan Adrian Voinea WHO/Europe, Copenhagen, Denmark

Role of epidemiology in the EU policy formulation of chemicals

Abstract Over the past 50 years, the European Union has built a robust legal framework for managing chemicals. This framework balances the benefits of using chemicals for societal well-being and economic prosperity with the need to protect human health and the environment from potential risks. As part of the EU’s Zero Pollution ambition in the context of the Green Deal, the European Commission adopted in 2020 the Chemicals Strategy for Sustainability, with the aim to better protect human health and the environment from harmful chemicals, while boosting innovation by promoting the use of safer and more sustainable chemicals. Assessing quantitative health impacts within the EC Better Regulation guidance typically involves indicators measuring the environmental burden of disease (EBD), providing a useful mean for legislators to evaluate the benefits of policy actions both in terms of health gains and cost. While such analyses are common in air pollution studies, challenges arise in the chemical legislation area, particularly in non-occupational settings, where the population is exposed to low concentrations of many chemicals through multiple exposure routes. In such contexts, the intrinsic complexities linked to exposure characterization and to the assessment of causality between the exposure and the health outcome may hinder the estimation of benefits of legislative actions. Debates may arise regarding the reliability of the underlying epidemiological studies, making challenging for policymakers to ascertain the robustness and generalizability of the findings of such analyses. Our work provides a summary and analysis of recent case studies in the context of chemicals. We focus on how epidemiological evidence was used in conducting EBD analyses in supporting better formulation of EU polices of chemicals. Speakers/Panelists Marleen Bekker Wageningen University & Research, Wageningen, Netherlands

The INPHET- a global approach to Environmental Public Health Tracking

Abstract Environment and health monitoring and information systems are fundamental infrastructure for evidence provision for policy making. The International Network for Public Health and Environment Tracking (INPHET) was formed by a community of environmental public health practitioners to address common interests and activities that advance environmental public health surveillance (EPHS) and data systems, and their uses to inform public health actions. Its main goal is to address the vast inequalities across countries and communities in their ability to monitor, assess, inform and mitigate environmental and health issues. INPHET supports the relevant role of environmental epidemiology as the pillar science providing evidence for decision making and interventions aiming at reducing and preventing environmental related diseases and contributes to an overall vision for public health. As a “Community of Practice”, INPHET focuses on sharing experiences and expertise; addressing common challenges for implementing and enhancing the science of EPHS/tracking; improving understanding of the link between the environment and health; and providing the appropriate evidence that informs public policy. The network, initiated in conference meetings in 2012-13 and formally launched in Modena, Italy in 2014, has carried out several activities which aim at sharing expertise and learning from different models of environmental and health data integration and surveillance systems that directly inform policy. These include Twinning cooperation with Euro-Asian and Balkan countries and sharing of expertise with African Public Health Agencies. Some experiences are presented in this workshop and highlight the EPHS/EPHT model adopted by several national public health agencies. It promotes that such integration and uses of environmental and health data is key for EPHS, including their accessibility and usability for communities of public health researchers, practitioners and policy makers.

Revisiting the epidemiological role of a native vector in Northern California vineyards

Abstract Effective disease management hinges on an accurate understanding of the ecological and epidemiological underpinnings of the pathosystem. New epidemics may prompt consideration of whether knowledge gaps or changes to the pathosystem warrant revision of management strategies. Pierce’s disease of grapevines is highly episodic in coastal Northern California vineyards, with modest incidence in most years punctuated by occasionally severe epidemics. To better understand what was driving a developing epidemic in the region, we revaluated what is known about the ecology and epidemiological role of the dominant vector, the blue-green sharpshooter Graphocephala atropunctata. We monitored vector spatiotemporal dynamics at 32 vineyards over three years, surveyed plant community composition in the adjacent habitat to understand its link to vector recruitment, and quantified patterns of natural infectivity for the pathogen Xylella fastidiosa. Overall, the results were consistent with past studies of G. atropunctata ecology. For example, the scale of dispersal from source habitat and seasonal patterns in activity were generally similar to those documented in prior studies. The results also confirmed the influence of adjacent plant community composition on G. atropunctata activity in vineyards, and the role of riparian habitat and select plant taxa as vector sources. Nonetheless, further consideration of the epidemiological significance of certain features of the pathosystem may be warranted, especially those related to seasonality in X. fastidiosa infection in vectors. A marked increase in infected G. atropunctata late in the season likely reflects pathogen acquisition from infected grapevines, which may have implications for disease management strategies.

Prevalence and concordance of penile, anal, and oral human papillomavirus infections among sexually active heterosexual men in Ibadan, Nigeria.

The data on epidemiology of Human papillomavirus (HPV) infections in men are scarce relative to women generally, particularly among men engaging in heterosexual relationships. This study investigated the prevalence and risk factors for penile, anal, and oral HPV in men in two communities in Ibadan, Nigeria. This was a cross-sectional survey involving a face-to-face interview, a clinical examination, and sample collection from participants. HPV genotyping was performed with Anyplex II 28 HPV assay. The prevalences and factors associated with HPV infections using multivariable models and concordance between sites. Of 316 men, the proportion of any HPV infection in the penile, anal, and oral sites was 40.5%, 9.7%, and 7.8%, respectively. The proportion of any high-risk HPV, low-risk HPV, and multiple HPV infections was highest in the penis followed by the anal and oral sites. Only 5/316 (1.6%) men had concordant HPV in all three sites, with the highest concordance in penile-anal sites relative to penile-oral and anal-oral sites. The odds of penile HPV were higher in men aged 25years and above. Having penile HPV was associated with higher odds of detecting anal HPV and vice versa. Oral HPV was less likely in men not living with their sexual partners. Penile HPV is the most common infection followed by anal HPV and oral HPV infections among heterosexual Nigerian men. Concordant HPV infections was highest in penile-anal sites. Nigerian men, as in other settings, are a reservoir of HPV and it is important to conduct more robust studies to appreciate their role in HPV transmission, epidemiology, and prevention.

Revisiting typing systems for group B Streptococcus prophages: an application in prophage detection and classification in group B Streptococcus isolates from Argentina.

Group B Streptococcus (GBS) causes severe infections in neonates and adults with comorbidities. Prophages have been reported to contribute to GBS evolution and pathogenicity. However, no studies are available to date on the presence and diversity of prophages in GBS isolates from humans in South America. This study provides insights into the prophage content of 365 GBS isolates collected from clinical samples in the context of an Argentinean multicentric study. Using whole-genome sequence data, we implemented two previously proposed methods for prophage typing: a PCR approach (carried out in silico) coupled with a blastx-based method to classify prophages based on their prophage group and integrase type, respectively. We manually searched the genomes and identified 325 prophages. However, only 80% of prophages could be accurately categorized with the previous approaches. Integration of phylogenetic analysis, prophage group and integrase type allowed for all to be classified into 19 prophage types, which correlated with GBS clonal complex grouping. The revised prophage typing approach was additionally improved by using a blastn search after enriching the database with ten new genes for prophage group classification combined with the existing integrase typing method. This modified and integrated typing system was applied to the analysis of 615 GBS genomes (365 GBS from Argentina and 250 from public databases), which revealed 29 prophage types, including two novel integrase subtypes. Their characterization and comparative analysis revealed major differences in the lysogeny and replication modules. Genes related to bacterial fitness, virulence or adaptation to stressful environments were detected in all prophage types. Considering prophage prevalence, distribution and their association with bacterial virulence, it is important to study their role in GBS epidemiology. In this context, we propose the use of an improved and integrated prophage typing system suitable for rapid phage detection and classification with little computational processing.

HPV and Lung Cancer: A Systematic Review

This systematic review aims to explore the diagnostic criteria, epidemiology, etiology, and prognosis of Human Papillomavirus (HPV) infection in lung cancer. This PRISMA-guided review searched the PubMed® and EmbaseTM databases for “lung cancer AND HPV” on 10 June 2023, filtering human subject papers. A total of 97 studies encompassing 9098 patients worldwide, revealing varied HPV infection rates in lung cancer, ranging from 0% to 69%, were analyzed. While HPV16/18 was predominant in some regions, its association with lung cancer remained inconclusive due to conflicting findings. Studies from Asia reported lower HPV infection rates compared to Western populations. Some studies suggested a limited role of HPV in lung carcinogenesis, particularly in non-smokers. However, intriguing associations were noted, including HPV’s potential role in lung adenocarcinoma and squamous cell carcinoma. Discrepancies in HPV detection methods and sample sources highlight the need for further research with standardized methodologies to elucidate HPV’s role in lung carcinogenesis and its clinical implications. Overall, this systematic review offers insights into HPV’s role in lung cancer epidemiology and clinical characteristics. Despite inconclusive evidence, intriguing associations between HPV and lung adenocarcinoma and squamous cell carcinoma have emerged. Further research with standardized methodologies and larger cohorts is needed for clarity.

The Impact of Public Health on Health Regulation

Public health and regulatory frameworks are interdependent, with public health advancements driving the evolution of health regulations, and health regulations reinforcing public health efforts. This review examines the relationship between public health initiatives and regulatory measures, tracing their historical development, particularly in response to diseases and social change. The focus includes the role of epidemiology, disease surveillance, and health promotion in shaping public health policies. Furthermore, it delves into the challenges governments and international organizations face in implementing effective health regulations, particularly in an increasingly globalized world. Finally, it highlights future directions for adaptive regulation, emphasizing the integration of technology and stakeholder engagement to overcome current public health challenges. Keywords: Public Health, Health Regulation, Disease Surveillance, Epidemiology, Health Promotion.

The Role of Epidemiology in Addressing Ableism.

The Role of Epidemiology in Addressing Ableism.

The Role of Public Health in Promoting Health Standards

Public health is essential for preserving and increasing global health standards. Public health activities, which include preventative measures, education, policy changes, and healthcare services, aim to reduce sickness and promote general well-being. This study investigates the historical evolution of public health, its fundamental principles, and the role of epidemiology in creating interventions like vaccination campaigns. It also emphasizes difficulties confronting public health systems, such as gaps in healthcare access, increasing infectious illnesses, and the need for adaptive solutions to shifting global health risks. Moving forward, comprehensive approaches and strong public health surveillance systems are required to maintain gains in promoting health standards. Keywords: Public health, health standards, disease prevention, epidemiology, vaccination programs, health equity.

GENETIC VARIABILITY AND GEOGRAPHIC DISTRIBUTION OF MYCOBACTERIUM TUBERCULOSIS LINEAGE 2

Mycobacterium tuberculosis (MTB) is a substantial threat to public health, infecting approximately 10 million individuals annually with tuberculosis. Among the genetic lineages of MTB, lineage 2 (L2), notably the Beijing family, plays a significant role in global tuberculosis epidemiology, accounting for nearly a quarter of all reported TB cases. Originating possibly in East Asia, this lineage spread globally, causing significant epidemics in Central Asia, Eastern Europe, and Eastern Africa. Geographic variability in the distribution of MTB L2 strains reveals diverse prevalence patterns among sublineages across different regions. L2.1 (proto-Beijing) is primarily composed of isolates originating from China, Thailand, and Vietnam, with a smaller number from Japan, Malaysia, and Indonesia. The ancestral sublineage, named L2.2.A, is mostly spread in China, Japan, and Thailand, while the modern sublineage, L2.2.M, is widespread, spanning almost the entire world. Moreover, the L2.2.M1 clade demonstrates a wide geographic spread, encompassing various countries across Asia and Australia, while other subclades of the L2.2.M2, L2.2.M3, and L2.2.M4 clades show more localized distributions across different regions. The L2.2.M4 clade comprises nine subclades, L2.2.M4.1 and L2.2.M4.2 are primarily found in Thailand, while L2.2.M4.3, L2.2.M4.6, and L2.2.M4.8 predominate in China. In South Africa, L2.2.M4.4 is the predominant subclade, whereas L2.2.M4.7 is associated with Nepalese isolates. In contrast, in regions such as Central Asia, Eastern Europe, and Russia, L2 strains, particularly the Modern Beijing sublineage, dominate. Notable examples include Europe/Russia W148 outbreak L2.2.M4.5 (B0W/148), Central Asia L2.2.M4.9 (CA), Central Asia outbreak L2.2.M4.9.1 (CAO), and Clade A L2.2.M4.9.2. Additionally, recent small clades like L2.2.M5 and L2.2.M6, originating from Vietnam, Thailand, and China, have emerged, with L2.2.M6 also detected in Kenya and South Africa. In Kazakhstan, we have identified such sublineages of L2 as CAO (n=69; 67.64%) L2.2.M4.9.1, CA (n=27; 26.47%) L2.2.M4.9, B0W/148 (n=5, 4.90%) L2.2.M4.5 and one isolate representative of a rare L2.2.M4 lineage (n =1; 0.98%). Strains of this lineage demonstrate the development of multidrug resistance (MDR) and extensive drug resistance (XDR), reflecting the emergence of resistance mechanisms against all available anti-tuberculosis drugs. In summary, M. tuberculosis lineage 2, especially the Beijing family, significantly impacts global tuberculosis epidemiology, with diverse prevalence patterns among sublineages across regions.

Trichinella spp. in wolves (Canis lupus) and red foxes (Vulpes vulpes) of southern Italy

Trichinella spp. are cosmopolitan parasites that infect a wide range of hosts, with wildlife being the main reservoir of these zoonotic nematodes, especially red foxes (Vulpes vulpes) and wolves (Canis lupus) due to their apex position in the food chain in most European countries. The aim of this study is to investigate the prevalence of Trichinella spp. in these wild canids and their epidemiological role in the Campania region (southern Italy). From 2017 to 2023, the carcasses of red foxes (n = 352) and wolves (n = 41) were collected as part of a health surveillance plan. Muscle samples were analysed individually by artificial digestion and four (1.1%) red foxes and nine (21.9%) wolves tested positive for Trichinella britovi. All Trichinella isolates were identified as T. britovi by multiplex PCR. Statistically significant differences in prevalence were found by province (p-value = 0.05) for red foxes and sampling years (p-value = 0.01) for wolves. The prevalence was lower in red foxes than in wolves, probably due to the longer life expectancy of wolves compared to red foxes and the role of wolves as apex predators compared to red foxes as meso-carnivores. The results obtained confirm the important role that these wild canids play in the circulation of the parasite.

First detection of Leishmania major in dogs living in an endemic area of zoonotic cutaneous leishmaniasis in Tunisia

BackgroundDogs are considered the main domestic animals that may be a reservoir for Leishmania infantum, the agent of zoonotic visceral leishmaniasis (ZVL) in several countries of the world. The dog may host other Leishmania species, but its epidemiological role in the maintenance and spreading of these parasites is not completely elucidated. Zoonotic cutaneous leishmaniasis (ZCL), caused by Leishmania major, affects thousands of people every year and is particularly diffused in many countries of North Africa and Middle East Asia. In ZCL endemic countries, few reports of L. major-positive dogs have been reported, probably because most human cases occur in poor rural areas where the social role of the dog and its medical management is not well considered. The aim of the present study is to better understand the possible involvement of domestic dogs in the epidemiology of ZCL.MethodsOur research focused on a well-established endemic focus of ZCL, in the area of Echrarda, Kairouan Governorate, central Tunisia. A total of 51 dogs with no or mild clinical signs of vector borne diseases were selected in small villages where human cases of ZCL are yearly present. All dogs were sampled for the Leishmania spp. diagnosis, by using the following procedures: blood sample for serology and buffy coat quantitative polymerase chain reaction (qPCR), popliteal fine needle aspiration, and cutaneous biopsy punch for lymph node and skin qPCR.ResultsThe results demonstrated a high percentage (21.6%) of dogs positive at least at one or more test; the most sensitive technique was the lymph node qPCR that detected 8/11 positive dogs. Nine, out of the eleven positive dogs, resulted as infected by Leishmania infantum; ITS1-PCR-sequencing allowed Leishmania major identification in the remaining two cases, both from the popliteal lymph node samples, which can suggest a possible visceral spread of a cutaneous Leishmania species in the dog. Interestingly, one of the two L. major-positive dogs was living in the same house where 6-year-old children showed cutaneous lesions referred to as ZCL.ConclusionsTo our knowledge, this is the first report of L. major-positive dogs in Tunisia, the epidemiological role of which remains under investigation.Graphical

Respiratory viral infections in children with cancer and febrile neutropenia and children undergoing hematopoietic stem cell transplantation.

The scope of this review is to understand the epidemiology and potential role of respiratory viral infections in children with cancer and febrile neutropenia, as well as in children, undergoing hematopoietic stem cell transplantation. Early detection of respiratory viral infections through molecular diagnostic techniques has allowed recent randomized clinical studies to advance the possibility of more rational use of antimicrobials in this susceptible population. Progress has been made in the early detection of respiratory viruses in episodes of fever and neutropenia in children with cancer. In selected patients who meet specific clinical safety criteria and have negative bacterial cultures, it has been possible to safely and effectively discontinue antimicrobials. This has been validated in recent randomized clinical studies. However, more evidence is still needed for a similar indication in children, undergoing hematopoietic stem cell transplantation with viral respiratory infection episodes. Understanding the role of respiratory viral infections in populations of immunocompromised children may contribute to a more rational use of antimicrobials and, in the near future, may help to decrease antimicrobial resistance in this susceptible population.

High-resolution mapping of linear epitopes from LiNTPDase2: Advancing leishmaniasis detection using optimized protein and peptide antigens

Visceral Leishmaniasis, caused by Leishmania infantum, is a tropical neglected disease and the most dangerous form of Leishmaniasis. It occurs zoonotically, with domestic transmission posing risks to humans as dogs have high susceptibility and are natural reservoirs of the parasite. Given their epidemiological role, improvements are needed in diagnosing Canine Visceral Leishmaniasis (CVL). Thus, we mapped linear epitopes from the rLiNTPDase2 antigen through peptide microarray and identified six positive epitopes. Validation through peptide ELISA revealed three promising peptides with accuracies of 78.6%, 85.92%, and 79.59%. Their combination yielded 97.58% accuracy. Negative epitopes were also found, which interacted with CVL-negative and Chagas Disease positive samples. Their removal from the rLiNTPDase2 sequence resulted in the rNT2.neg, which obtained enhanced specificity over rLiNTPDase2. The rNT2.neg validation achieved 87.50% sensitivity, 90.55% specificity, and 93.5% accuracy within 127 CVL-positive and 96 CVL-negative samples. Therefore, three peptides and rNT2.neg show significant promise for CVL diagnosis.

Isolation of community-associated methicillin-resistant Staphylococcus aureus (MRSA) sequence type (ST) 30 from house rats (Rattus tanezumi) in Hong Kong.

Methicillin-resistant Staphylococcus aureus (MRSA) is of major public health concern due to its resistance to multiple antibiotics. This resistance has been observed in various settings, including hospitals and communities, and has been detected in both animals and humans. Although peridomestic rat species (Rattus spp.) are well described reservoirs of several human pathogens and antimicrobial resistant bacteria, little is known about their role in MRSA epidemiology. In order to investigate whether Rattus spp. in Hong Kong are potential carriers of MRSA, 221 rats were caught from various ecological areas and nasopharyngeal samples were cultured on MRSA selective media. Genotypic characteristics of MRSA were confirmed by whole genome sequencing. Two clonal sequence type (ST) 30 MRSA isolates, harbouring mecA on staphylococcal chromosome cassette (SCC) mec type IVc, were cultured from two house rats (Rattus tanezumi) caught in two densely populated urban areas. To the best of the authors' knowledge, this is the first detection of community-associated (CA)-MRSA strain ST30 SCCmec IVc in peridomestic rodents in Hong Kong and globally. Our finding indicates that house rats can be carriers of MRSA strains that are widely distributed in the community.

Investigation of Rabies virus in wild mammals of the atlantic forest in Rio de Janeiro, Brazil.

With the successful control of rabies transmitted by dogs in Brazil, wild animals have played a relevant epidemiological role in the transmission of rabies virus (RABV). Bats, non-human primates and wild canines are the main wild animals that transmit RABV in the country. It is worth highlighting the possibility of synanthropic action of these species, when they become adapted to urban areas, causing infections in domestic animals and eventually in humans. This work aimed to evaluate the circulation of RABV in the Pedra Branca Forest, an Atlantic Forest area, located in the state of Rio de Janeiro, Southeast Brazil. Saliva and blood samples were obtained from 60 individuals of eight species of bats, captured with mist nets, and 13 individuals of callitrichid primates, captured with tomahawk traps. Saliva samples were subjected to Reverse Transcription Polymerase Chain Reaction (RT-PCR), targeting the RABV N gene, with all samples being negative. Blood samples of all animals were submitted to the Rapid Fluorescent Focus Inhibition Test (RFFIT) to detect neutralizing antibodies (Ab) for RABV. Six bat samples (8%) were seropositive for RABV with antibody titers greater than or equal to 0.1 IU/mL. The detection of Ab but not viral RNA indicates exposure rather than current RABV transmission in the analyzed populations. The results presented here reinforce the importance of serological studies in wildlife to access RABV circulation in a region.

Multilocus sequence typing of pathogenic treponemes isolated from contagious ovine digital dermatitis stage five lesions: Implications for disease transmission dynamics

Contagious ovine digital dermatitis (CODD) causes a severe, infectious foot disease and lameness of sheep, is common within the UK and is now also emerging in other countries. As well as causing severe animal welfare issues, huge economic losses emerge from the disease due to weight loss/lack of weight gain, and veterinary treatments. CODD lesion progress is measured, with a scoring system from 1 (early lesions) to 5 (healed). Here, using samples from an experimental flock infected by natural means, samples were taken from CODD stage 5 lesions, post treatment, and subjected to bacterial isolation and MLST using previously published methods. Sequences were compared to others from the same flock, and those from previous studies.All CODD 5 lesions produced viable Treponema spp. bacteria. High levels of variation of bacteria were seen, with 12 sequence types (STs) for T. medium phylogroup (11 new), 15 STs for T. phagedenis phylogroup (9 new) and six T. pedis STs, of which two were new. This study shows that CODD stage 5 lesions still contain viable bacteria, representing all three known pathogenic Treponema spp. phylogroups, and these may thus play a role in disease transmission and epidemiology despite appearing healed after treatment. The high level CODD treponeme variability within an infected flock where sheep were bought from different sources, as might occur in common agricultural practice, may suggest reasons as to why the bacterial disease is difficult to treat, control and eradicate, and adds further complexity to the polybacterial pathogenesis of these lesions.