Irukandji 'influx' in Qld prompts warning

An irukandji "influx" has prompted warnings for swimmers to cover up and only use patrolled beaches in north Queensland.

Five people, including a 10-year-old-girl, have reported being stung in the region's waters in the last week.

Surf Life Saving Queensland north Queensland regional manager Col Sparkes says northerly winds have created "perfect conditions" for dangerous stingers.

He urged swimmers to stay between the flags and in protective nets, wear protective clothing and enter the water slowly.

They should also take note of all signs and never swim at a closed beach, he said.

"That significantly increases your protection when it comes to marine stingers, and also ensures that lifesavers or lifeguards are on hand to assist," he said.

Highly venomous irukandji jellyfish are also believed to be the culprits in stings further south.

On Wednesday, a 12-year-old boy was stung on the upper left thigh off Hamilton Island.

He was taken to the island's medical centre in a stable condition.