The recommendation follows a four-day meeting of the Strategic Advisory Group of Experts on Immunization.
A final report will be issued in December, the WHO said in a statement.
SAGE said moderately and severely immunocompromised persons should be offered an additional dose of all WHO-approved vaccines “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.”
People aged 60 and older who received the Sinovac and Sinopharm vaccines should get a third dose too, the experts added, though the use of other vaccines may also be considered depending on supply and access, the WHO informed.
“When implementing this recommendation, countries should initially aim at maximising 2-dose coverage in that population, and thereafter administer the third dose, starting in the oldest age groups”, they said.
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