University of Sydney Virologist Professor Anthony Cunningham Tony Cunningham says Australia is entering the time of the year where people need to “think about immunisation” against the flu.

His comments follow Australia experiencing an early wave of the flu season.

“Particularly for people in the most vulnerable groups,” he told Sky News Australia.

“But particularly for people over the age of 65 … six months to five years, and in First Nations people any time over the age of six months, vulnerable people also who have heart and lung disease and who have impairment of their immune system.

“They really must protect themselves against influenza.”