An outbreak of Cryptosporidium parvum in a Surrey pool with detection in pool water sampling.

Cryptosporidium parvum is a protozoal pathogen that causes acute, watery diarrhea. Outbreaks of cryptosporidiosis have been associated with exposure to contaminated drinking water, recreational water, consumption of apple cider and produce, and contact with infected individuals in health care and child day-care settings(1). Cryptosporidium oocysts are highly resistant to the chemical disinfectants used to purify drinking water and recreational water sources, such as pools and water parks.