"Burden of severe disease in these age groups is low and high coverage [of vaccination] has not yet been achieved in all countries among those groups who are at highest risk of severe disease," the message reads.
Using mathematical modeling, the organization's experts calculated methods to optimize the distribution of a limited number of vaccines: reducing mortality can be achieved by booster doses to high-risk populations, instead of using the same doses for primary immunization of low-risk groups.
"As supply increases and vaccination is expanded to lower priority age groups, trade-offs may need to be considered as to prioritizing booster vaccination to high-risk populations over expanding primary immunization coverage to younger populations," WHO presumes.
As it was reported, recently Prime Minister of the United Kingdom Boris Johnson said that a booster dose could protect against a new coronavirus version Omicron.
The World Health Organization (WHO) has given recommendations for a booster dose of vaccination against Covid.