More than 600 Victorians have tested positive for Ross River virus in the past six weeks as authorities warn of another mosquito-borne virus outbreak.
The rare Kunjin virus has been found in a flock of chickens in Shepparton after a significant jump in mosquito numbers over summer.
"Recent rain and relatively warm weather has created conditions ideal for mosquito breeding and we have seen a significant increase in mosquito numbers as a result," Victorian Chief Health Officer Charles Guest said on Wednesday.
The Kunjin virus - a subtype of the potentially deadly West Nile virus - can cause a more significant illness than other mosquito-related viruses, such as Ross River.
Ross River virus has recently been found in huge numbers in Victoria, with more cases recorded in the first six weeks of 2017 than reported in 2015 and 2016 combined.
So far 618 people have tested positive for the disease since January 1, with Victoria's northern areas accounting for 60 per cent of cases.
About 120 cases have been recorded in Melbourne, including 25 last week.
Mosquito breeding sites are being treated in 18 local government areas in an attempt to control the population.
Professor Guest warned the appearance of Kunjin symptoms - described as fever, headache, fatigue and aching muscles or joints - can take up to 14 days to appear.
People experiencing symptoms should seek immediate medical attention from their GP or local hospital.
TIPS FOR REDUCING MOSQUITO POPULATIONS
* check insect screens on doors and windows for tears or gaps
* wear long, light-coloured, loose-fitting clothing and apply a repellent containing picaridin or DEET to areas of exposed skin
* empty water from containers, old tyres, unused fish ponds and pot plant holders at least once a week
Source: Victorian Health Department
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