More than 70 per cent of Australians have had at least three shots of the COVID-19 vaccine – that's the normal two doses, plus a smaller booster shot.
A second booster dose – a fourth total jab – is currently recommended for certain vulnerable groups, such as those over the age of 65, or those whose immune systems are severely weakened.
The Australian Technical Advisory Group on Immunization provides recommendations to the government on the feasibility of a COVID-19 vaccine.
His latest advice, published in late May, states that – for the health of people under 64 years old – one booster is enough to protect them from serious illness.
