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Protozoan parasites of the  Cryptosporidium  genus cause severe cryptosporidiosis in newborn lambs. However, asymptomatic infections also occur frequently in lambs and ewes. In sheep, the most commonly detected  Cryptosporidium  species are  C. ubiquitum ,  C. xiaoi  and  C. parvum.  Due to a lack of relevant information about such infections in France, we investigated the situation on five dairy sheep farms in the Pyrénées-Atlantiques Department in south-western France in December 2017. Individual fecal samples were collected from 79 female lambs (5–17 days old) and their mothers (72 ewes). Oocysts were screened using Heine staining before and after Bailenger concentrations.  Cryptosporidium  species identification and genotyping were performed using real-time PCR and  gp60  gene sequencing. No cases of clinical cryptosporidiosis were observed in the 79 lambs. Microscopically,  Cryptosporidium  spp. oocysts were observed in only one lamb on one farm (prevalence 1.3%) and one ewe on another farm (prevalence 1.4%). By contrast,  Cryptosporidium  spp. DNA was detected in 17 ewes (prevalence ranging from 10.5% to 50% depending on the farm) and in 36 lambs (prevalence ranging from 0% to 77.8% depending on the farm). Only zoonotic  Cryptosporidium parvum  IId and IIa genotypes were identified when genotyping was possible.  Cryptosporidium ubiquitum  and  C. xiaoi  were detected on one and three farms, respectively. We conclude that healthy young lambs and their mothers during the peripartum period could be a source of environmental contamination with oocysts.

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Asymptomatic <i>Cryptosporidium</i> infections in ewes and lambs are a source of environmental contamination with zoonotic genotypes of <i>Cryptosporidium parvum</i>

Asymptomatic Cryptosporidium infections in ewes and lambs are a source of environmental contamination with zoonotic genotypes of Cryptosporidium parvum