We identified an unusual subtype of a Cryptosporidium sp. horse genotype as the cause of cryptosporidiosis in a 13-year-old girl in Poland who was undergoing immunosuppressive treatment for juvenile rheumatoid arthritis and Crohn's disease. The same subtype was identified in a horse the girl had ridden.
Keywords: Crohn’s disease; Cryptosporidium; cryptosporidiosis; enteric infections; genotype; horse; horse-specific; human; intestinal infections; juvenile rheumatoid arthritis; parasite; protist; transmission; zoonoses.