Cryptosporidiosis

Clear→ stable

Gastrointestinal

Current NYS Status

924 cases in 2024 — near the 5-year baseline of ~2,066.

2024 statewide cases: 924

Source: NYSDOH Annual Communicable Disease Report 2024 + 5-yr baseline

What is it?

Cryptosporidiosis is caused by Cryptosporidium parasites and is a leading cause of waterborne disease outbreaks in the US. NYS had 924 cases in 2024. Cryptosporidium is notable for its resistance to standard chlorine levels used in pools and water parks, making it a common cause of recreational water outbreaks.

How it spreads

Spreads through swallowing contaminated recreational water (pools, splash pads, water parks), drinking water, or food. Also spreads through contact with infected animals or people. Cases peak in summer when recreational water use is highest.

Symptoms

Watery diarrhea, stomach cramps or pain, nausea, vomiting, dehydration, weight loss, and low-grade fever. In healthy individuals, illness typically lasts 1–2 weeks. In immunocompromised individuals, it can be chronic, severe, and life-threatening.

Who is at risk?

Young children in daycare, travelers, people who work with animals, and immunocompromised individuals (especially those with HIV/AIDS) who can develop severe, prolonged illness.

What you can do

🛡Do not swallow water when swimming; shower before entering a pool

🛡Keep children with diarrhea out of pools, splash pads, and water parks for at least 2 weeks after diarrhea resolves

🛡Wash hands after contact with animals, especially farm animals and their environments

👁People with HIV/AIDS should consult their provider about water treatment options and extra precautions

Tier B — Annual report tracking

Based on NYSDOH annual communicable disease report. Threat level reflects 2024 case counts compared to the 5-year baseline.

Seasonality: summer

This information is for general public health awareness and is not a substitute for professional medical advice, diagnosis, or treatment.