An increase in demand for the flu vaccine has affected supplies. Credit:Shutterstock

Victoria’s supply of flu vaccines is almost exhausted and remaining supplies will be reserved for those at most risk of falling seriously ill until more stocks can be secured.

In the meantime, health authorities in Victoria have told immunisation providers to limit the vaccine to children between six months and five years of age; pregnant women; Indigenous people aged 15 years and over; people with medical conditions that could make them more likely to fall severely ill with flu; and those aged over 65 years.

The shortage has been caused by unprecedented demand, with almost 10 million flu doses released nationwide ahead of this year's influenza season, and almost 1.6 million doses provided in Victoria.