Moore River closure remains as highly infectious norovirus identified as source of spike in gastro-illness

Authorities have confirmed a highly infectious stomach bug is behind a recent spike in illness reports from people swimming in Moore River.

WA Health and the Shire of Gingin on Wednesday confirmed there had been several cases of norovirus in people who have recently taken a dip in the river in Guilderton, about 92km north of Perth.

It has been closed since January 31 after elevated bacteria levels were detected in the water and an increase in reports of a gastro-type illness following the Australia Day long weekend.

Norovirus is highly contagious and is one of the most common causes of gastroenteritis.

It is commonly accompanied by vomiting and diarrhoea, but can also result in nausea, stomach cramps, headache, a low grade fever, chills and muscle aches.

There is no specific treatment for the virus, which can cause outbreaks in schools, child care centres, aged care facilities, cruise ships, restaurants and hospitals.

The shire and WA Health said the health warning remains and the advice continues to be to avoid swimming and all other direct water contact activities in the river.

“It is possible that there are still viable norovirus particles in the river, as the virus can survive for up to 3 weeks,” a shire spokesperson said.

“People who continue to swim in Moore River while the warning signs are displayed may be at increased risk of gastrointestinal illness.”

Authorities are continuing microbial water quality surveillance in the area and will provide updates as further information comes to hand.

Anyone who has been in Moore River and is experiencing symptoms such as nausea, vomiting, diarrhoea or abdominal pain should seek medical attention and request testing through their GP.

They are also encouraged to notify WA Health’s Environmental Health Directorate on 9222 2000 or email ehinfo@health.wa.gov.au.

WA Health advises anyone with gastrointestinal illness not to swim in public swimming pools or the river until they are free of symptoms for at least 48 hours to avoid passing the illness on to others.

People with confirmed or suspected norovirus infection should:

• Drink plenty of fluids such as plain water or oral rehydration drinks to avoid dehydration
• Avoid anti-vomiting or anti-diarrhoeal medications unless prescribed or recommended by a doctor.