>"COVID-19 patients should take two doses of the new Pfizer/BioNTech vaccine within a period of 21-28 days, the head of the World Health Organization's immunization advisory group said on Tuesday."
>"COVID-19 patients should take two doses of the new Pfizer/BioNTech vaccine within a period of 21-28 days, the head of the World Health Organization's immunization advisory group said on Tuesday."