Cryptosporidium parvum and Cryptosporidium hominis are intracellular protozoan parasites that may produce gastrointestinal symptoms when ingested by humans. Up until 2002, C. parvum was named C. parvum genotype 2 (cattle genotype) and C. hominis was named C. parvum genotype 1 (the human genotype). They are now recognised as different species based on genetic distinctions.
Cryptosporidium parvum and Cryptosporidium hominis - Microbial pathogen data sheet
Food Safety, What's In Our Food, Bacteria & Viruses in Food