Is there a need for improved Cryptosporidium diagnostics in Swedish calves?

► We examined whether Cryptosporidium diagnostics in diarrhoeal calves needs improvement. ► Cryptosporidium spp. and subtype distribution in diarrhoeal calves were examined. ► Routine diagnostics for diarrhoeal calves suffice in their present state. ► Cryptosporidium bovis could have a pathogenic potential. ► Subtypes show a clonal within-herd pattern and subtype family IIa is most prevalent..