WHO said there was, "a growing body of evidence regarding the value of an additional booster dose" for groups including health workers, people aged over 60, and those with weak immune systems. “In those most at risk for severe disease or death ...
the additional benefit of an additional booster dose of mRNA vaccine might be warranted," the WHO said, acknowledging that there could be logistical or other challenges to offering people a second booster dose in some countries.
As per the WHO's data, rich countries have vaccinated over 70% of their population whereas fewer than 16% of the population in poorer countries have been immunized.
WHO has slammed rich countries for offering Covid booster doses and called for a moratorium on the practice, saying boosters are unnecessary for healthy people.