The World Health Organization (WHO) vaccine advisory group today weighed in with recommendations for delivering the Pfizer-BioNTech vaccine, urging th e vaccine doses be given 21 to 28 days apart in most circumstances, but in certain situations allowing for an interval of up to 6 weeks.
"Countries experiencing exceptional epidemiological circumstances may consi der delaying for a short period the administration of the second dose as a pragmatic approach to maximizing the number of individuals benefiting from a first dose while vaccine supply continues to increase. WHO?s reco mmendation at present is that the interval between doses may be extended up to 42 days (6 weeks), on the basis of currently available clinical trial d ata. Should additional data become available on longer intervals between do ses, revision of this recommendation will be considered. Countries should e nsure that any such programme adjustments to dose intervals do not affect t he likelihood of receiving the second dose."