The Department of Health is urging Victorians to take simple steps to reduce the spread of cryptosporidiosis, a type of gastroenteritis, with cases expected to increase through summer.
There have been 1,125 cryptosporidiosis notifications in Victoria so far this year. This follows a record 2,350 notifications in 2024.
Cryptosporidiosis is a parasitic infection (germ) that can cause watery diarrhoea and stomach cramps lasting several weeks. People with weakened immune systems are at greater risk of prolonged illness.
Rates of infection usually follow a cyclical pattern year to year, with cases typically peaking in the warmer months. Outbreaks have been associated with public swimming pools, contaminated water supplies and childcare centres.
Deputy Chief Health Officer Christian McGrath said simple precautions can make a big difference in preventing outbreaks, particularly when using public swimming pools.
“Staying out of the water for two weeks after diarrhoea is one of the most effective ways to stop cryptosporidiosis spreading,” Dr McGrath said.
Cryptosporidiosis is highly resistant to normal chlorine levels, which means even well-maintained pools can be affected.
“Just one case can cause an outbreak at your local pool. Good hygiene before swimming makes a real difference in protecting the whole community,” Dr McGrath said.
“If you or your child develop symptoms, speak to your doctor and avoid swimming until you’re fully recovered. These small steps help keep our pools clean and prevent outbreaks across Victoria."
Five simple steps people can take to help keep the water clean:
- Do not swim for two weeks after diarrhoea stops if you have had cryptosporidiosis or diarrhoea
- Shower and wash with soap, especially your bottom, before swimming
- Wash your hands with soap after going to the toilet or changing a nappy
- Change nappies in nappy change areas only
- Avoid swallowing pool water
Anyone who thinks they or their child may have cryptosporidiosis should contact their doctor for testing and advice.
Find out more about how to be prepared for cryptosporidiosis and practise healthy swimming.
Reviewed 31 December 2025
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