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Background  Cryptosporidiosis is a zoonotic disease caused by the protozoan parasite  Cryptosporidium  spp. that can affect domestic animal and human populations. In newborn ruminants, cryptosporidiosis is characterized by outbreaks of diarrhea, which can result in high morbidity and economic impact. The aim of the present study was to determine the prevalence of  Cryptosporidium  spp. in small ruminants from the Perote municipality in Veracruz State, Mexico. One hundred and sixty small ruminants (80 sheep and 80 goats) from eight farms located in four towns of the Perote municipality were examined following a cross-sectional study design. Stool samples were analyzed by a modification of the Faust centrifugation method, and the presence of  Cryptosporidium  spp. oocysts was examined using a modification of the Ziehl-Neelsen staining procedure. Bivariate and multivariate analyses were used to assess the association of  Cryptosporidium  infection and the general characteristics of the animals studied.    Results  Overall, 112 (70 %, 95 % CI: 62.3–76.9) of the 160 small ruminants sampled were infected with  Cryptosporidium  spp. The prevalence of  Cryptosporidium  spp. infection in goats was 72.5 % (95 % CI: 61.4–81.9) and in sheep 67.5 % (95 % CI: 56.1–77.6). Small ruminants aged 1 month old had the highest (88.2 %; 95 % CI: 63.6–98.5) prevalence of infection. Prevalence varied from 60 % to 85 % among herds. Animal species, age, sex, breed, farm, town or cohabitation with cattle did not influence the prevalence of  Cryptosporidium  infection.    Conclusions  A high prevalence of infection with  Cryptosporidium  spp. was observed in small ruminants from the Perote municipality in Veracruz, Mexico. Infection was widely distributed among sheep and goats regardless of their age, breed or farm location. Further research is required to identify risk factors for, and to assess the veterinary public health significance of  Cryptosporidium  infection among sheep and goats in the Mexican state of Veracruz.

Prevalence of Cryptosporidium in small ruminants from Veracruz, Mexico