Abstract:

Data pertaining to previous echinococcosis cases and local cases were collected from the National Notifiable Disease Reporting System and hospitals in Shangri-La City, and Jiantang, Xiaozhongdian and Geza townships with high prevalence of echinococcosis were sampled as study areas. Based on the Results of surveillance on echinococcosis prevalence in dogs in three townships in Shangri-La City from 2019 to 2021, the positive rate of Echinococcus coproantigens was classified into three strata (high, moderate and low) in each administrative village, and one to three natural villages were randomly sampled from each stratum as study sites. In June 2022, a cluster random sampling method was employed, with one dog feces sample collected from each household, and fecal samples randomly collected from wayside ownerless or stray dogs, and more than 200 dogs were investigated in each township. Echinococcus coproantigen was detected in dogs using ELISA, and factors affecting the prevalence of Echinococcus infections were identified in domestic dogs. A total of 1 587 dogs were detected for Echinococcus coproantigens, with a positive rate of 4.03% (64/1 587), and the positive rates of Echinococcus coproantigens were 3.16% (35/1 107) in domestic dogs and 6.04% (29/480) in ownerless or stray dogs, respectively (χ² = 6.265, P < 0.05). The positive rates of Echinococcus coproantigens were 4.60% (41/891), 3.18% (14/440), and 3.52% (9/256) in dogs in Jiantang, Xiaozhongdian, and Geza townships, respectively (χ² = 12.030, P < 0.05). The positive rates of Echinococcus coproantigens were 3.48% in male domestic dogs and 2.68% female domestic dogs (χ² = 1.184, P > 0.05), and the positive rate of Echinococcus coproantigens was 4.11% in dogs at ages of over 10 weeks, with no age-specific positive rate detected (χ² = 2.384, P > 0.05). The positive rates of Echinococcus coproantigens were 5.56% in wolfhound dogs, 36.36% in free-range dogs, 3.39% without deworming during the latest three months, and 17.20% in dogs that had been fed diseased organs, respectively, and there were significant differences in the positive rates of Echinococcus coproantigens in domestic dogs in terms of dog breeds, ranging styles, deworming during the past three months, and feeding with diseased organs (χ² = 15.431, 49.121, 5.291, 65.391, all P < 0.05). Logistic regression analysis showed that dog breeds, ranging styles, deworming during the past three months, and feeding with diseased organs were significantly associated with Echinococcus infections in dogs. The prevalence of Echinococcus infection is relatively high in dogs in Shangri-La City, and an emphasis on intensified management of dogs is recommended for echinococcosis prevention and control.

Key words: Echinococcus, Infection factor, Analysis, Yunnan Province, Shangri-La City