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Background  Cystic echinococcosis (CE) is a parasitic zoonosis caused by infection with the larval stage of  Echinococcus granulosus  ( s.l. ). This study investigated the prevalence and potential risk factors associated with human CE in the towns and rural areas of Ñorquinco and Ramos Mexia, Rio Negro province, Argentina.    Methods  To detect abdominal CE cysts, we screened 892 volunteers by ultrasound and investigated potential risk factors for CE using a standardized questionnaire. Prevalence ratio (PR) with 95% confidence intervals (CI) was used to measure the association between CE and the factors investigated, applying bivariate and multivariate analyses.    Results  Abdominal CE was detected in 42/892 screened volunteers (4.7%, 95% CI 3.2–6.1), only two of whom were under 15 years of age. Thirteen (30.9%) CE cases had 25 cysts in active stages (CE1, CE2, CE3a, according to the WHO Informal Working Group on Echinococcosis [WHO-IWGE] classification). The most relevant risk factors identified in the bivariate analysis included: living in rural areas ( P  = 0.003), age > 40 years ( P  = 0.000), always drinking water from natural sources ( P  = 0.007), residing in rural areas during the first 5 years of life ( P  = 0.000) and having lived more than 20 years at the current address ( P  = 0.013). In the multivariate final model, the statistically significant risk factors were: frequently touching dogs ( P  = 0.012), residing in rural areas during the first 5 years of life ( P  = 0.004), smoking ( P  = 0.000), age > 60 years ( P  = 0.002) and living in rural areas ( P  = 0.017).    Conclusions  Our results point toward infection with CE being acquired since childhood and with constant exposure throughout life, especially in rural areas with a general environmental contamination.    Graphic AbstractSupplementary Information  The online version contains supplementary material available at 10.1186/s13071-021-04753-y.

parasites and vectors

Prevalence of human cystic echinococcosis in the towns of Ñorquinco and Ramos Mexia in Rio Negro Province, Argentina, and direct risk factors for infection