New research at Cornell University reinforces what livestock producers suspected all along — cattle are rarely, if ever, responsible for water-borne outbreaks of cryptosporidiosis in humans. These results were revealed to audiences at the American Association of Bovine Practitioners annual conference this fall.

Scientists investigated several outbreaks across the country and concluded that in every human case, only evidence of the crypto genotype that solely infects humans could be found. Cattle do not carry this genotype, meaning that city water system filtration problems should carry the blame, not cows in the watershed.