Head of World Health Organisation seeks Covid-19 vaccine booster moratorium

World Health Organisation director-general Tedros Adhanom Ghebreyesus, left, and United Nations High Commissioner for Refugees Filippo Grandi watch the opening ceremony at the 2020 Summer Olympics in Tokyo (Leon Neal/AP)

The head of the World Health Organisation is calling for a moratorium on administering booster jabs of Covid-19 vaccines as a way to help ensure that doses are available in countries where few people have received their first dose.

WHO director-general Tedros Adhanom Ghebreyesus made the appeal mostly to wealthier countries that have far outpaced the developing world in numbers of vaccinations.