Flu Symptoms 2024 How Long Does It Last In Australia. Those between 65 and 74 years are advised to get a booster shot at least every 12 months. For people aged 75 years and older, a booster shot is recommended every 6 months.
Those between 65 and 74 years are advised to get a booster shot at least every 12 months. Flu symptoms usually appear two to three days after contact with the virus, according to the university of pennsylvania health system, but you may start to feel sick.
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