• New Zealand's Director-General of Health Ashley Bloomfield receives his first dose of a COVID-19 vaccine at the Pipitea Marae vaccination centre in Wellington on 23 August 2021. Picture: Ross Giblin/AFP

    No need for a vaccine third jab booster: study

    Some countries have started offering extra doses over fears about the much more contagious Delta variant, causing the World Health Organization to call for a moratorium on third jabs amid concerns about vaccine supplies to poorer nations, where millions have yet to receive their first jab.