Virtually every state in Australia will refund GPs and pharmacists for any private flu vaccines they administer, as case numbers quadruple in just two weeks. 

Last week, Queensland announced it will reimburse practices $21.95 for each private flu vaccine they administer.

But that move has now triggered similar announcements in SA, WA and NSW, with Victoria expected to announce its own funding package later this week.

The rapid expansion of the funding should benefit millions of Australians as flu cases begin to rise.