If you haven't had COVID or a booster shot in the last six months, the chances are you're more vulnerable than you think. 

In a few weeks, a fifth dose of a COVID vaccine will be offered to anyone over 18, and we're being urged to take it up. 

Today, epidemiologist Catherine Bennett on how we're entering a new phase of the pandemic. 

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Professor Catherine Bennett, chair in epidemiology, Deakin University