Ross River virus warning issued for Geelong, Surf Coast regions amid La Nina

This year is already the worst on record for Ross River virus cases in the Geelong and Surf Coast regions with a leading health expert warning of infection ahead of higher than average rainfall.

Doctors are warning people to protect themselves against mosquitoes amid a wet summer weather forecast.

It follows a surge in cases of mosquito-borne Ross River virus locally last summer.

Local GP and Western Victoria Primary Health Network clinical spokeswoman Anne Stephenson said the occurrence of La Nina this summer meant it was likely that there would be higher than average rainfall.

“The extra moisture has potential to create conditions conducive to mosquito breeding,” Dr Stephenson said.

“There is every chance that we will see lots of mosquitoes and the potential for people to be infected with the Ross River virus.

“Ross River infections generally peak in the region through the warmer months from December to April.”

Another wetter than expected summer makes perfect breeding conditions for mosquitoes to spread Ross River fever. Picture: Chris Ison

Dr Stephenson said the incubation period for the virus was usually three to nine days but could be up to 21 days, so there was often a lag time between infection and diagnosis.

“With the recent warm weather and rain, there is clear evidence of mosquito activity now and there is a real chance of infection,” she said.

This year is already the worst on record for both Greater Geelong and the Surf Coast for cases of the virus.

Greater Geelong has recorded 117 cases so far this year and the Surf Coast 107, according to health department data.

“Around 10 per cent of people infected will have a prolonged illness,” Dr Stephenson said.

“People can have ongoing disabling fatigue, persistent muscle and joint pain for more than 12 months after infection, but most people’s symptoms resolve in three to six months.

“People should take precautions to avoid being bitten by mosquitoes.”

Barwon South West public health unit director Eugene Athan said the increased rainfall from La Nina in Australia would provide good conditions for mosquito breeding, which was likely to lead to higher cases of Ross River virus.

“Barwon Health will continue to monitor cases in our region,” Prof Athan said.

Healthdirect Australia chief medical officer Nirvana Luckraj said if a mosquito had previously bitten an animal carrying a disease that humans could pick up, such as Ross River virus, the most commonly transmitted via mosquito in Australia, your health could be affected.

Dr Luckraj said if people felt unwell or developed flu-like symptoms they should see their doctor.

“If you’re not sure, download the healthdirect app to check your symptoms and get

advice,” she said.

Originally published as Ross River virus warning issued for Geelong, Surf Coast regions amid La Nina