Investigating the prevalence and risk factors of cystic echinococcosis in humans and slaughtered cattle in peri-urban dogowning smallholder farms in Mekelle zone, Tigray Region, Northern Ethiopia

Abstract

Background: Cystic Echinococcosis (CE), a zoonotic disease caused by the larval stage of Echinococcus granulosus, poses significant public health and economic challenges in Ethiopia. Despite its impact, data on its prevalence in humans, slaughtered cattle, and dogs particularly in the Tigray Regional State, remain limited. Objective: Investigating the prevalence and risk factors of cystic echinococcosis in humans and slaughtered cattle in peri-urban dog- owning smallholder farms in Mekelle zone, Tigray Region, Northern Ethiopia. Method: A cross-sectional study was carried out from March 2024 to March 2025 involving 832 human participants, 212 cattle, and 384 dogs. Human participants were selected using a stratified sampling technique, while the peri-urban smallholder farms owning dogs were purposively selected in the Mekelle Zone. Hydatidosis screening was performed using abdominal ultrasound, and laboratory analysis was conducted on specimens from slaughtered cattle and fecal samples from their dogs. Microscopic examination (40×) was used to detect hydatid cysts in cattle and taeniid eggs in dog feces. Data were analyzed using SPSS version 27, applying descriptive statistics and logistic regression to identify factors associated with CE at a significance level of p < 0.05. Result: The overall prevalence of CE from six purposively selected sub-districts of Mekelle zone was found to be 0.24% (2/832) in humans, 22.64% (48/212) in cattle, and 17.45% (67/384) in dogs. The two human cases involved a 45-year-old male, and 50-yearold women. In cattle, distribution of cysts was primarily found (68.75%) in the lungs and (25.0%) in liver and (2.08%) each in the kidneys, heart, and spleen. Fertility and viability in cattle (68.8%) in lungs and (25.0%) in liver. CE prevalence was higher in male cattle (24.52%) than in females (16.0%), and poor body condition (40.0%) compared to those with medium (22.45%), and good (17.07%). Backyard-slaughtered cattle had a higher infection rate (34.69%) than those slaughtered in abattoirs (19.01%). Factors significantly associated with CE in cattle included age, sex, body condition, and slaughter location (p < 0.05). In the multivariate logistic regression analysis adult cattle (AOR = 2.57; 95% CI:1.501,4.400; P = 0. 001), cattle with poor body condition score (AOR = 4.07; 95% CI: 2.177,7.618; P = 0.000), and cattle slaughtered at backyard slabs (AOR = 2.26; 95% CI: 1.300,3.940; P = 0.004) were more likely to acquire hydatid cysts than the others. After adjusting for potential confounders, dogs with stray roaming behavior (AOR = 2.93; 95% CI: 1.11–7.71; p = 0.029) and feed raw offal (AOR = 2.86; 95% CI: 1.38–5.93; p = 0.005) had significantly higher odds of CE infection. Conclusion: The present study showed that CE is a considerably prevalent disease in human, cattle and dogs in the study area. This emphasizes the need to avoid backyard slaughter practice, unsafe offal feeding of dogs, and proper waste disposal which requires public awareness on the use of abattoirs.