A central Queensland man says he is among four people from Theodore, west of Bundaberg in southern Queensland, hospitalised with flood-related infections.

Trevor Breadley says he became ill after walking through floodwaters.

He says his experience highlights the dangers of floodwaters.

"I'd like to warn people not to go in flood water unnecessarily - that's how I got this bug," he said.

"Doctors are fighting frantically trying to find a name on it and a cure for it - it's some soil-borne, water-carrying infection."