Serological and molecular analysis of Leishmania infection in a recent outbreak of visceral leishmaniasis in South Omo Zone, Ethiopia.

BACKGROUND: Ethiopia has a high burden of visceral leishmaniasis. Recently, there was a significant increase in cases in the South Omo Zone. This study aims to assess the prevalence of Leishmania donovani infection and its associated factors. METHODS: A household-based cross-sectional study was carried out in January 2023 in the South Omo Zone in Ethiopia. Dried blood spot samples were collected from 382 randomly selected study participants. Direct agglutination test (DAT) and kinetoplast DNA real-time PCR tests were performed to detect L. donovani infection. Participants' sociodemographic, clinical and risk factors for L. donovani infection data were collected using questionnaires. Bivariate and multivariate logistic regressions were used to analyze the data. Febrile cases were checked for malaria with a multiplex PCR assay. RESULTS: Overall prevalence of L. donovani infection among the sampled population was 32.5% (n=124), of which 41.1% (n=51) was detected by PCR, 33.9% (n=42) by DAT and 25.0% (n=31) by both tests. The majority of the positives were from the Logira (28.2%; n=35) and Dilbayne (29.0%; n=36) villages. Participants residing in Logira (adjusted OR [AOR]: 5.80; 95% CI 1.85 to 18.15) and Dilbayne (AOR: 3.38; 95% CI 1.15 to 9.96) villages and owning cows (AOR: 2.31; 95% CI 1.03 to 5.15) showed an association with Leishmania infection. Plasmodium falciparum was detected in 3.4% (n=2) of 59 febrile participants. CONCLUSIONS: The prevalence of L. donovani infection in the South Omo Zone is high. Further research on the role of cows in the transmission cycle is needed to design the best strategy to control Leishmania infection in the South Omo Zone. Such interventions should focus on the Logira and Dilbayne villages, where most of the infections were identified.

Distribution of snake species and snakebites in hotspots of Ethiopia.

INTRODUCTION: In Sub-Saharan Africa, snakebites are a public health problem. In Ethiopia, clinical cases have been described, but little information exists on snakebites burden and its geographical distribution. The aim of this study was to document the spatial distribution of venomous snakes and snakebites in Ethiopia. METHODOLOGY: In a cross-sectional observational study, venomous snakes were collected during snake catching activities in six Ethiopian hotspot areas between April 2015 and September 2020. Species and habitat were described. In the hotspot areas, routine health information data on reported snakebites was collected in 78 districts and subsequently used to map annual incidence per district. RESULTS: A total of 333 snakes were collected and 14 species were identified. The most prevalent species were Bitis arietans, Bitis arietanus somalica, Echis pyramidum, known as vipers, and Naja pallida, known as cobra. The highest number of snakes (75) was observed in the Northwest and Eastern parts of Ethiopia, mostly in cultivation and man-made farm land, wooded and moist dry savanna. In each hotspot a wide variety of species was observed, although composition was different. The highest snakebite incidence overlapped with the high snakes densities in Northwest Ethiopia. The snakebite annual average incidence at district level was very heterogeneous and ranged from < 15 cases/100,000 inhabitants (44% of the districts) to 309.2 cases/100,000 inhabitants. CONCLUSIONS: Snake diversity and distribution, linked to high incidence of snakebites in the hotspots, suggests a close interconnection between human, animal and environmental systems and could inform the need for antivenoms per geographical locality.

Abate application practices in the Guinea worm endemic region of Gambella, Ethiopia: identification of elimination gaps.

INTRODUCTION: Guinea worm disease is caused by Dracunculus medinensis. Transmission of the disease depends on vectors (copepods). Abate applications in targeted water sources to control copepod is the main intervention. The aim of this study was to assess vector control practice in the guinea worm endemic region of Gambela, Ethiopia and to identify elimination gaps. METHODOLOGY: Retrospective analysis of routine program data recorded from 2016 to 2020 was performed. Pre-and post-copepod test is conducted on water ponds to determine the density of copepods. Based on the copepod density, the chemical is applied accordingly. The five years data was obtained from Ethiopian public health institute electronic database with permission. RESULTS: A total of 22,131 water ponds were treated during the past five years. Out of the total treated in 2020, 4,669/7,266 (64%) were found with > 9 Copepods during pre-copepod test. 130/7,266 (1.79%) of water ponds which were post-tested after Abate application failed the requirement of scoring ≤ 9 copepods. Of the 130 water ponds, 115 (88.5%) were observed during the transmission season (April to November). Abate application trend had increased by 28.9% during the 5 years period. According to the database, some of the largest water sources found in infection reporting villages missed their 28 days regular treatment schedule. CONCLUSIONS: A single water source that has not been treated effectively could be a source of infection for both humans and animals. The practice of Abate application should be enhanced and monitored regularly. The documenting system should be improved for quality, timely information and action.