Health experts say days of rain in Cairns, in far north Queensland, could lead to more people catching dengue fever.
Another four cases of the mosquito-borne virus were confirmed in the Whitfield area yesterday.
There have now been 34 cases in two separate outbreaks this summer.
Dr Richard Gair from the Cairns Public Health Unit says residents need to watch out for mosquito breeding sites, such as water pooling in buckets and containers.
"It's important that people check their yards regularly after the rains," he said.
"If there's anything that they can see collecting water, get rid of them.
"Turn things over, throw things away.
"I think it's a worry if we've got water in those containers around the house, whether we get hundreds of millimetres of rain or just rain as we would normally get in this time of year.
"People just need to check and get rid of those containers.
"If there's going to be a lot of rain, then they need to check regularly, at least once a week."
© ABC 2013
12:54 EST Southern New South Wales and the ACT had a chilly start to the weekend, with some places seeing their coldest May night in half a decade.