Covid-19 vaccines authorised by the WHO. "Moderately and severely immunocompromised persons should be offered an additional dose...
since these individuals are less likely to respond adequately to vaccination following a standard primary vaccine series and are at high risk of severe Covid-19 disease," the UN health agency's strategic advisory group of experts on immunisation said.
In addition to this, it said that people over 60 who have been fully immunised with China's Sinovac and Sinopharm vaccine should be offered a third Covid-19 vaccine dose. "For the Sinovac and Sinopharm inactivated vaccines, an additional (third) dose of the homologous vaccine should be offered to persons aged 60," said the advisory group.