Vulnerable populations will soon be able to get a fourth Covid-19 vaccine, six months after the last

Older people, residents in aged and disability care .... and immunocompromised people 16 and over, are included.

The Medicines Act will be amended ro allow roll-out from mid-June, with most eligible from July.

Immunisation Advisory director, Doctor Nikki Turner, says two primary doses and a booster is sufficient for most people.

She says protection's starting to drop off after six months in older people, and those with more vulnerable immune systems.