1997 Minnesota Zoo Cryptosporidiosis Outbreak
In July 1997, the Minnesota Department of Health (MDH) reported an outbreak of cryptosporidiosis among children who visited the Minnesota Zoo (MMWR Weekly, October, 1998). A total of 369 cases were reported, of which 73 had Cryptosporidium identified from stool samples. The onset of illness (i.e. vomiting or diarrhea) occurred 3 to 15 days after exposure to the contaminated zoo fountain.