When did Pfizer’s CEO stop publicly projecting a possible October success and why?
On 16 October, Bourla explained in an “
open letter” that though the companies
might know “whether or not our vaccine is effective by the end of October,” the new FDA guidelines meant they could not file for an EUA
until the third week in November at the earliest. To increase confidence in the safety of these vaccines, the FDA revision—which the Trump administration
attempted to block—said that before a company applied for an EUA, 2 months must have passed since at least half of the participants in a trial had received their final shot. Most vaccine-related side effects occur within that period.