The U.S., then Alberta, the U.K. and now Australia, and all with the same message: If you’re recovering from diarrhea, stay out of the pool.

This time it’s New South Wales Health – it’s nearly summertime in Sydney — which has reported 129 reported cases of cryptosporidiosis in November, compared to 32 cases the previous month.

NSW Health communicable diseases director Jeremy McAnulty said people who had suffered attacks of diarrhoea should wait two weeks before using swimming pools, adding,

"While there is no common link among most cases, in the past very large outbreaks in NSW have been caused by people swimming in contaminated pools. Pools can easily be contaminated by infectious swimmers and so it is vital that people take care not to contaminate pools."