Australians are being urged to get the flu shot this month so they don't contract the disease and coronavirus at the same time causing a serious double-up of illness.
More than 13.5 million doses of seasonal influenza vaccine have been secured for the national program.
"Vaccinating against the flu will reduce the risk of a very dangerous double-up of flu and coronavirus - both diseases affecting the respiratory system," Health Minister Greg Hunt said on Wednesday.
"Fewer cases and fewer severe cases of flu will result in less demand on our health care system."
Australia's flu season is expected to peak between June and September. Vaccinating against the disease in April will provide the greatest protection.
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With Australian Associated Press