Nurse Sandra Lindsay receives the second dose of a Pfizer coronavirus (COVID-19) disease at Long Island Jewish Medical Center on January 4, 2021 in Queens, New York.
Shannon Stapelton | Getty Images
BioNTech and partner Pfizer warned Monday that they have no evidence that their jointly developed vaccine will still protect against Covid-19 if the shot is given later than tested in trials.
“The safety and efficacy of the vaccine have not been evaluated on different dosing schedules, as the majority of trial participants received the second dose within the window specified in the study design,” the companies said in a joint statement. shots given three weeks apart.
“There is no evidence to show that protection is maintained after the first dose after 21 days.”
Germany on Monday considered whether to allow a delay in the administration of the second dose to allow scarce supplies to extend further after a similar move by Britain last week. Separately, Denmark approved a delay of up to six weeks between the first and second shot of the vaccine.