Final answer:
Cryptosporidium parvum, a parasite, is most commonly found in animals and can be spread through contaminated water and food. Outbreaks of cryptosporidiosis often occur through contamination of the public water supply, water parks, swimming pools, and day-care centers.
Step-by-step explanation:
Cryptosporidium parvum, a parasite, is most commonly found in animals and can be spread through contaminated water and food, as well as through human contact with infected animals or their feces. Outbreaks of cryptosporidiosis often occur through contamination of the public water supply, water parks, swimming pools, and day-care centers. The risk of infection is greater in areas with poor sanitation, making the disease more common in developing countries.