Being a globally emerging mite-borne zoonotic disease, scrub typhus is a serious public health concern in Nepal. Mapping environmental suitability and quantifying the human population under risk of the disease is important for prevention and control efforts. In this study, we model and map the environmental suitability of scrub typhus using the ecological niche approach, machine learning modeling techniques, and report locations of scrub typhus along with several climatic, topographic, Normalized Difference Vegetation Index (NDVI), and proximity explanatory variables and estimated population under the risk of disease at a national level. Both MaxEnt and RF technique results reveal robust predictive power with test The area under curve (AUC) and true skill statistics (TSS) of above 0.8 and 0.6, respectively. Spatial prediction reveals that environmentally suitable areas of scrub typhus are widely distributed across the country particularly in the low-land Tarai and less elevated river valleys. We found that areas close to agricultural land with gentle slopes have higher suitability of scrub typhus occurrence. Despite several speculations on the association between scrub typhus and proximity to earthquake epicenters, we did not find a significant role of proximity to earthquake epicenters in the distribution of scrub typhus in Nepal. About 43% of the population living in highly suitable areas for scrub typhus are at higher risk of infection, followed by 29% living in suitable areas of moderate-risk, and about 22% living in moderately suitable areas of lower risk. These findings could be useful in selecting priority areas for surveillance and control strategies effectively.

We know from human genetic studies that practically all aspects of biology are strongly influenced by the genetic background, as reflected in the advent of 'personalized medicine'. Yet, with few exceptions, this is not taken into account when using laboratory populations as animal model systems for research in these fields. Laboratory strains of zebrafish (Danio rerio) are widely used for research in vertebrate developmental biology, behaviour and physiology, for modelling diseases, and for testing pharmaceutic compounds in vivo. However, all of these strains are derived from artificial bottleneck events and therefore are likely to represent only a fraction of the genetic diversity present within the species. Here we use Restriction site-Associated DNA sequencing (RAD-seq) to genetically characterize wild populations of zebrafish from India, Nepal and Bangladesh, and to compare them to previously published data on four common laboratory strains. We measured nucleotide diversity, heterozygosity and allele frequency spectra, and find that wild zebrafish are much more diverse than laboratory strains. Further, in wild zebrafish there is a clear signal of GC-biased gene conversion that is missing in laboratory strains. We also find that zebrafish populations in Nepal and Bangladesh are most distinct from all other strains studied, making them an attractive subject for future studies of zebrafish population genetics and molecular ecology. Finally, isolates of the same strains kept in different laboratories show a pattern of ongoing differentiation into genetically distinct substrains. Together, our findings broaden the basis for future genetic, physiological, pharmaceutic and evolutionary studies in Danio rerio.

Dogs are often commensal with human settlements. In areas where settlements are adjacent to wildlife habitat, the management of dogs can affect risk of spillover of disease to wildlife. We assess dog husbandry practices, and measure the prevalence of Canine Distemper Virus (CDV) in dogs, in 10 villages in Nepal's Annapurna Conservation Area (ACA), an important region for Himalayan wildlife. A high proportion (58%) of owned dogs were allowed by their owners to roam freely, and many village dogs originated from urban areas outside the region. CDV antibodies, indicating past exposure, were detected in 70% of dogs, and 13% were positive for P-gene, suggesting current circulation of CDV. This is the first detection of canine distemper virus in a National Park in Nepal Himalaya. Dogs were generally in good condition, and none exhibited clinical signs of CDV infection, which suggests that infections were asymptomatic. CDV exposure varied with village location and age of dogs, but this variation was minor, consistent with high rates of movement of dogs across the region maintaining high seroprevalence. Residents reported the occurrence of several species of wild carnivores in or close to villages. These results suggest a high potential for transmission of CDV from village dogs to wild carnivores in ACA. We suggest that control of dog immigration, along with vaccination and neutering of dogs could mitigate the risk of CDV spillover into wild carnivore populations.

This paper reports and discusses a case of bilateral lupus retinopathy with macular edema in a patient diagnosed with systemic lupus retinopathy and treated with combined intravitreal bevacizumab (0.025 mL/0.625 mg) and intravitreal dexamethasone (0.05 mL/0.2 mg). The patient was a 25-year-old female with a history of diminution of vision in both eyes. Best corrected visual acuity (BCVA) of the right eye was 2/60 and of the left eye was 1/60. Fundus examination revealed bilateral swelling of the optic disc nasally, cotton wool spots, and multiple flame shaped, dot and blot hemorrhages in the disc and macula. Optical coherence tomography (OCT) revealed macular edema in both eyes. Despite being treated with immunosuppressive the visual acuity did not improve. Two doses of combined intravitreal bevacizumab (0.025 mL/0.625 mg) and dexamethasone (0.05 mL/0.2 mg) were given to the patient in both eyes at an interval of one week. Two weeks after the last intravitreal injection the BCVA was 6/24 and N8 in both eyes. Fundus examination revealed a decrease in the number and size of hemorrhages, and resolution of the blurred disc margin, cotton wool spots, and hard exudates. OCT of the macula 2 weeks after the last intravitreal injection showed a significant decrease in macular edema. The intraocular pressure was not elevated for a period of 6 months. This case would be a unique case of lupus retinopathy with macular edema receiving a combined half dose of intravitreal injection bevacizumab and dexamethasone with promising results. This could be beneficial in a set up where the patients cannot afford intraocular steroid implants.