coronavirus can be extended to up to six weeks.WHO’s Strategic Advisory Group of Experts on immunization, known as SAGE, formally published its advice after a full review of that vaccine, which is the first to get emergency approval from the U.N.
health agency to fight the COVID-19 pandemic. It said an interval of 21 to 28 days between the doses is recommended. Canada investigating timing of second coronavirus vaccine dose, Tam says But the U.N.