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Underdiagnosis and underreporting of scrub typhus has increasingly affected public health in Bhutan since its initial detection in 2008. Identifying scrub typhus risk factors would support early diagnosis and treatment for this nonspecific febrile disease, reducing the incidence of potentially fatal complications. We conducted a hospital-based, case‒control study during October‒December 2015 in 11 scrub typhus‒prone districts. We identified harvesting cardamom as the major risk factor (odds ratio 1,519; p<0.001); other factors were traditional housing, largely caused by an outside toilet location, as well as owning a goat and frequently sitting on grass. Harvesting vegetables, herding cattle in the forest, and female sex were protective. Age had a nonlinear effect; children and the elderly were more likely to seek treatment for clinical scrub typhus. This study has informed public health policies and awareness programs for healthcare workers through development of National Guidelines for Prevention, Treatment and Control of Scrub Typhus in Bhutan.

Bovine tuberculosis (bTB) is a chronic disease of cattle and the leading cause of zoonotic tuberculosis. In Bhutan, there is no dedicated program for bTB despite the country being situated in the bTB enzootic region, where a large section of population relies on cattle and raw milk and, dairy products are widely consumed.To contribute to the design of future education, surveillance, mitigation, and control programs, we investigated the knowledge, attitudes, and practices relevant to bTB among dairy farmers. We surveyed 264 farmers in Thimphu, Paro, and Haa Dzongkhags. These farmers contribute to supplying the eight milk outlets in the capital, Thimphu. We found that only 11 farmers (4.2%; confidence interval 95%: 2.1% - 7.3%) were aware that bTB existed, and only five of them (1.9%; CI 95%: 0.6% – 4.3%) were aware that bTB is a zoonosis. Risk perception and practice followed a gradient of variation from Thimphu to Haa, but overall, we found a correlation between bTB risk perception for animals and humans. Farmers and traders, along with the consumption of meat and sick animals, were perceived as occupations and activities involving the highest risk of zoonotic infection. Contact with animals entering the herd and with neighbouring cattle were perceived as the highest risk for animal infection. Most farmers in Haa consume raw milk and dairy products they produced by themselves, whereas farmers in Paro and Thimphu prefer powdered milk. Using generalised low-rank models and k-means clustering, we found that dzongkhag of residence and attitudes toward zoonotic infection prevention explained most variability in the data. The severe knowledge deficits about bTB are particularly concerning given the zoonosis is present in Bhutan, is prevalent in neighbouring countries, and negatively affects cattle health and well-being, diminishing fertility, milk, and overall productivity, ultimately impacting farmers’ livelihoods and undermining Bhutan’s nutritional and economic reliance on this sector. Urgent short and mid-term activities should be prioritised to identify bTB high-risk areas, educate farmers, and mitigate bTB impacts.

Livestock farming plays an important role in supporting the livelihood of resource-poor subsistence farmers in Bhutan. However, ticks and tick-borne diseases (TBDs) are one of the major constraints to livestock farming due to their negative effect on health and production. To date, no study has been conducted in Bhutan to assess farmers’ knowledge, attitude, and practices (KAP) about ticks and TBDs in cattle, although such information is essential in ensuring the development and adoption of effective prevention and control measures. Therefore, a KAP survey was conducted among 246 cattle owners in the Samkhar sub-district of eastern Bhutan in June 2019, using a structured questionnaire. Based on our scoring criteria, 52% [95%CI: 45.5–58.4] had adequate knowledge about ticks as potential vectors of diseases. Logistic regression analysis showed that the individuals who practiced a stall-feeding system of cattle rearing were 2.8 times [OR = 2.8 (95%CI: 1.66–4.78)] more likely to have adequate knowledge than others. Sixty-eight percent [95%CI: 62.5–74.4] had a favorable attitude toward tick prevention and control programs. Men were 1.95 times [OR = 1.95 (95%CI: 1.09–3.55)] more likely to have a favorable attitude than women, and the individuals who practiced a stall-feeding system were 2.59 times [OR = 2.59 95%CI: 1.45–4.78)] more likely to have a favorable attitude than others, after adjusting for the effect of other variables in the model. Overall, only 38% [95%CI 32.5–45] of the respondents reported tick infestation as one of the most important animal health problems, but 100% reported using acaricides to control ticks in cattle. Despite a high level of acaricide usage, the level of knowledge was low among the farmers interviewed. Findings from this study underline the importance of considering identified knowledge gaps and initiating education efforts to improve the adoption of effective tick prevention and control measures among farmers.

Background Rabies continues to pose significant public health challenges in many developing countries including Bhutan. A probable case of rabies was admitted to our hospital and its reporting led to the uncovering of an outbreak in domestic and wild animals. We discuss the challenges in the diagnosis and management of rabies in a resource-limited setting. Case presentation A 35-year-old male presented with intermittent fever, bilateral lower limb weakness that was rapidly progressive, urinary incontinence with episodes of palpitations and sweating. He had sustained a Category III bite on the right lower thigh with four bite marks, inflicted by a stray dog. He had received post-exposure prophylaxis with intra-dermal anti-rabies vaccine. On initial examination, the patient was in distress but cooperative for the interview. He had pulse rate ranging from 60 to 100/min with episodes of diaphoresis and palpitations, but with normal capillary blood glucose. In the lower limb, the muscle power was zero with absent tendon reflexes in the lower limb and impaired abdominal reflex below T 10 level. He had hyperaesthesia below T 8 , hydrophobia, aerophobia and photophobia. He had multiple spontaneous fasciculations in both the thighs and right deltoid and these later involved the intercostal muscles, neck and face muscles. He had altered sensorium and desaturation for which he required mechanical ventilation. Polymerase chain reaction for rabies virus was negative in cerebrospinal fluid and saliva. Rabies virus neutralizing antibody was negative in cerebrospinal fluid but had high titres in the serum. He received Human Rabies Immunoglobulin after admission. He was managed in the intensive care unit and died 23 days later. After this case was notified, a rapid response team was deployed in the field, and uncovered rabies outbreak in animals in the locality. Conclusions This case called for a serious evaluation of the country’s efforts in achieving zero rabies deaths by 2030. The management of this case identified several critical areas of context-specific interventions in Bhutan. There is also an urgent need to improve diagnostic capabilities at the national reference laboratory and enhance the technical competencies of healthcare workers in the management of dog bite cases. Graphical Abstract

Background Rabies is endemic in southern Bhutan, associated with 1–2 human deaths and high post exposure prophylaxis (PEP) costs annually. Evaluation of clinicians’ management of human cases potentially exposed to rabies could contribute to improving PEP prescribing practices to both reduce unnecessary costs associated with PEP and reach the target of zero human deaths due to rabies by 2023. Methods A cross-sectional survey of 50 clinicians’ management of human cases potentially exposed to rabies was conducted in 13 health centers in high-rabies-risk areas of Bhutan during February–March 2016. Results Data were collected on clinicians’ management of 273 human cases potentially exposed to rabies. The 50 clinicians comprised health assistants or clinical officers (55%) and medical doctors (45%) with a respective median of 19, 21 and 2 years’ experience. There was poor agreement between clinicians’ rabies risk assessment compared with an independent assessment for each case based on criteria in the National Rabies Management Guidelines (NRMG). Of the 194 cases for which clinicians recorded a rabies risk category, only 53% were correctly classified when compared with the NRMG. Clinicians were more likely to underestimate the risk of exposure to rabies and appeared to prescribe PEP independently of their risk classification.. Male health assistants performed the most accurate risk assessments while female health assistants performed the least accurate. Clinicians in Basic Health Units performed less accurate risk assessments compared with those in hospitals. Conclusions This study highlights important discrepancies between clinicians’ management of human cases potentially exposed to rabies and recommendations in the NRMG. In particular, clinicians were not accurately assessing rabies risk in potentially exposed cases and were not basing their PEP treatment on the basis of their risk assessment. This has significant implications for achieving the national goal of eliminating dog-mediated human rabies by 2030 and may result in unnecessary costs associated with PEP. Recommendations to improve clinician’s management of human cases potentially exposed to rabies include: reviewing and updating the NRMG, providing clinicians with regular and appropriately targeted training about rabies risk assessment and PEP prescription, and regularly reviewing clinicians’ practices.

Background Zoonotic diseases pose an increasing threat to human, animal and environmental health, and identifying the zoonoses of greatest public health concern is key to address them effectively. Despite high ongoing risks from zoonotic diseases, Bhutan has never conducted a zoonotic disease prioritization exercise. Therefore, the present study aimed to prioritize the top 10 zoonotic diseases in Bhutan and develop action plans to support targeted resource allocation, coordinated surveillance, and strategic planning through the One Health framework. Methods The current study used a literature review of peer-reviewed publications and grey literature, expert knowledge, followed by a workshop to prioritize zoonoses in Bhutan. The workshop was convened in April 2024, and 42 participants from 20 different organizations from human, animal, wildlife, environmental, and food safety sectors participated in the workshop. Zoonotic disease prioritization was conducted using a mixed-method approach that combined an expert consensus approach with the U.S. Centers for Disease Control and Prevention One Health Zoonotic Disease Prioritization (OHZDP) tool. Results The initial literature review listed 55 zoonotic diseases for prioritization in the country. The workshop prioritized the top 10 zoonotic diseases viz., Rabies; Influenza A H5N1; Leptospirosis; Brucellosis; Escherichia coli infections; Dengue; Scrub Typhus; Bovine tuberculosis; Anthrax; and Salmonellosis. Joint action areas for the top five zoonotic diseases were developed to effectively address each disease through the One Health approach in the country. Conclusion The prioritized zoonoses in Bhutan should be used for strengthening One Health coordination. Key recommendations from the OHZDP workshop emphasized strengthening disease surveillance, building laboratory diagnostic capacity, enhancing intersectoral collaboration, and developing a harmonized, interoperable system for information sharing and reporting. These measures aim to improve real-time data exchange, facilitate joint outbreak investigations, and support evidence-based decision-making for the prevention and control of zoonotic diseases.

Head and neck cancers are among the commonest cancers in the developing world. Personal habits, such as the use of tobacco, betel nut and alcohol are strongly associated with the development of head and neck cancers at certain sites. Therefore, they are among the preventable cancers. In Bhutan, there has not yet been a study conducted on head and neck cancers. To describe baseline epidemiological and histopathological characteristics of head and neck cancers in Bhutan. This is a 7-year descriptive study of all cases of head and neck cancers presented at the Jigme Dorji Wangchuk National Referral Hospital from 2011 to 2017. The data were collected from the hospital's medical records section, histopathology records, patient referral unit and some treatment centres in India. Prior approval was sought from the Research and Ethics Board for Health, the Ministry of Health and the hospital management. There were a total of 515 cases of head and neck cancers from 2011 to 2017. The crude incidence rate was 10 per 100,000 and the overall age adjusted rate was 12.3 (95% CI 9.5-15.1) per 100,000 population. The prevalence during this 7-year period was 69.1 per 100,000 population. The commonest cancers are thyroid, oral cavity, hypopharyngeal, laryngeal and nasopharyngeal cancer in decreasing order. Head and neck cancers are more common in males than females in the majority of sites except thyroid, salivary gland and sinonasal malignancies. Thyroid cancers and nasopharyngeal cancers are found to affect younger age groups. Tashigang (48) followed by Paro (43) recorded the highest number of cases. Squamous cell carcinoma is the commonest histopathology type in almost all the cases, while papillary carcinoma is the commonest among thyroid cancers. Personal habits, such as smoking, chewing tobacco, betel nut and alcohol consumption, were found to be more common among patients suffering from oral cavity, laryngeal, hypopharyngeal and oropharyngeal cancers. Head and neck cancers are the third most common cancer in Bhutan after stomach cancer and cervical cancer. Thyroid, oral cavity and hypopharynx are the top three anatomical sites for head and neck cancers in Bhutan. The current epidemiological and histopathological profile of head and neck cancers will form a baseline of information and basis for further research on head and neck cancers in Bhutan.

Tick infestation is the most reported parasitological problem in cattle in Bhutan. In May and June 2019, we collected ticks from 240 cattle in two districts of Eastern Bhutan. Tick presence, diversity, and infestation prevalence were examined by morphological identification of 3600 live adult ticks. The relationships between cattle, geographic factors, and infestation prevalence were assessed using logistic regression analyses. Habitat suitability for the tick species identified was determined using MaxEnt. Four genera and six species of ticks were found. These were Rhipicephalus microplus (Canestrini) (70.2% (95% confidence interval (CI): 68.7–71.7)), Rhipicephalus haemaphysaloides Supino (18.8% (95% CI: 17.5–20.1)), Haemaphysalis bispinosa Neumann (8.2% (95% CI: 7.3–9.1)), Haemaphysalis spinigera Neumann (2.5% (95% CI: 2–3)), Amblyomma testudinarium Koch (0.19% (95% CI: 0.07–0.4)), and a single unidentified Ixodes sp. Logistic regression indicated that the variables associated with infestation were: longitude and cattle age for R. microplus; latitude for R. haemaphysaloides; and altitude and cattle breed for H. bispinosa and H. spinigera. MaxEnt models showed land cover to be an important predictor for the occurrence of all tick species examined. These findings provide information that can be used to initiate and plan enhanced tick surveillance and subsequent prevention and control programs for ticks and tick-borne diseases in cattle in Bhutan.

BackgroundThe devastating effects of global health threats at the human-animal-environment interface have highlighted the continued need to improve collaboration between the human, animal, and environment health sectors. The National Bridging Workshop (NBW) Program contributes to this effort, gathering representatives from relevant sectors to assess their collaborative capacities and to develop a joint Roadmap to strengthen them.MethodsWe conducted NBWs in 58 countries and 51 Roadmaps are publicly available. A document analysis of these Roadmaps was conducted using a hybrid inductive-deductive coding approach. Roadmap activities were coded, categorized, and quantified for descriptive analysis. Hierarchical clustering (HCA) and principal component analysis (PCA) were applied to examine co-occurrence and variability across countries and activities. Jaccard index was used to assess inter-country alignment and regional trends were evaluated.ResultsThe analysis identified 60 distinct activity types (codes), grouped into six key themes, describing 2028 activities, providing unique and meaningful insight into how countries plan to improve their One Health capacity. Of these 60 activity types, 37 were present in a third of Roadmaps or more. The HCAs revealed an absence of clustering between activities or countries and the PCA confirmed a high degree of variability. The highest Jaccard similarity score between two countries was 0.64, and intra-regional (0.34) and inter-regional (0.32) average similarity scores were almost identical.ConclusionsThe activity needs, and their frequency, can help streamline international efforts to support countries in building their multisectoral collaborative capacities. With no dominant patterns of activity inclusion identified across countries or regions, our results offer concrete evidence for the need to tailor the One Health approach to countries’ national contexts. The findings support the growing body of literature that emphasizes the absence of a “one-size-fits-all” approach. They also demonstrate that the NBW method supports this needed flexibility.This study is the first to investigate One Health needs from such a broad range of countries, based on a common, standardized tool. Our findings offer critical insights into national and, by extension, global priorities for One Health collaboration, that can guide the development of tools and strategies that align with the specific needs articulated by countries.

In 2018, Bhutan reported 54 cases of malaria, of which six were indigenous, 14 introduced and 34 imported. Considering the continuous reduction in the number of indigenous cases, Bhutan plans to eliminate malaria by 2025 under the Bhutan Malaria Elimination Strategy. The study was conducted to assess the presence of asymptomatic plasmodial infection in both, Bhutanese population living in malaria-risk areas and in migrant workers to guide the elimination strategies. A cross-sectional study was conducted from April to May 2016 in 750 Bhutanese people and 473 migrant workers. Plasmodium falciparum and Plasmodium vivax infections were investigated by using a rapid diagnostic test (RDT) and the polymerase chain reaction (PCR). Prevalence of asymptomatic plasmodial infection based on PCR was 0.27% (95% CI: 0.05–1.07%) among Bhutanese people with a mean age of 43 years old. The proportions of males and females were 45% and 55%, respectively. Among migrant workers, the prevalence of asymptomatic plasmodial infection was 0.42% (95% CI: 0.07– 1.69%) with a mean age of 30 years old. The majority of migrant workers were from the neighboring Indian State of West Bengal (57.51%), followed by Assam (12.26%). RDT in both study groups did not detect any plasmodial infection. The presence of a low prevalence of asymptomatic plasmodial infection indicates that the current elimination strategies and interventions are effective.