Pfizer CEO Albert Bourla said Tuesday it’s important to give the second dose of the company’s Covid-19 vaccine on time, but added that he didn’t think “giving it a week later or two is a very big issue.”
“You need to make sure you give the second doses as the studies recommend the vaccine works which is in three weeks,” Bourla said during the Bloomberg The Year Ahead event. “In our study we actually had from 19 to 42. Within this framework, I’m fine. Beyond that, it’s serious.”
While the proposed window between doses was 21 days in Pfizer’s vaccine efficacy trial, it still included participants who received their second doses within a “predefined window” of 19 to 42 days, according to FDA materials.
There have been concerns that the limited vaccine supply will prevent people from getting their second doses of vaccines on time.
Some more context: Last week, the US Centers for Disease Control and Prevention updated its vaccine guidance to state: ”The second dose should be administered as close to the recommended interval as possible.
However, if it is not feasible to adhere to the recommended interval, the second dose of Pfizer-BioNTech and Moderna COVID-19 vaccines may be scheduled for administration up to 6 weeks (42 days) after the first dose. There are currently limited data on efficacy of mRNA Covid-19 vaccines administered beyond this window. If the second dose is administered beyond these intervals, there is no need to restart the series.”