It’s “very risky” to delay the second dose of Covid-19 vaccines because efficacy data was based on a specific dosing schedule, a former FDA director told CNBC on Thursday.
His comments came after the U.K.’s decision to administer second shots of the coronavirus vaccine 12 weeks after the first dose, in departure from what is recommended by the vaccine producers. Germany is reportedly considering a similar move, while Denmark approved a six-week gap between doses.
The vaccines approved for use in the U.K. both require two doses.
