The chief government of Pfizer said on Friday that the corporate wouldn’t apply for emergency authorization of its coronavirus vaccine earlier than the third week of November, ruling out President Trump’s assertion {that a} vaccine could be prepared earlier than Election Day on Nov. 3.

In an announcement posted to the corporate web site, the chief government, Dr. Albert Bourla, mentioned that though Pfizer may have preliminary numbers by the top of October about whether or not the vaccine works, it will nonetheless want to gather security and manufacturing information that can stretch the timeline to at the very least the third week of November.

Shut watchers of the vaccine race had already recognized that Pfizer wouldn’t be able to meet the requirements of the Food and Drug Administration by the top of this month. However Friday’s announcement represents a shift in tone for the corporate and its chief, who has repeatedly emphasised the month of October in interviews and public appearances.

In doing so, the corporate had aligned its messaging with that of the president, who has made no secret of his need for an accepted vaccine earlier than the election. He has even singled out the corporate by identify and mentioned he had talked to Dr. Bourla, whom he referred to as a “nice man.”

Some scientists applauded Pfizer’s announcement.

“That is good, actually good,” mentioned Dr. Eric Topol, a scientific trial skilled at Scripps Analysis in San Diego who was one among 60 public well being officers and others within the medical group who signed a letter to Pfizer urging it to not rush its vaccine.

Sustain with Election 2020

He mentioned firm officers had assured him {that a} vaccine would most definitely not be approved earlier than the election, however the letter Friday is “much more stable about their not being a part of any political machinations.”

Dr. Bourla has pushed again in opposition to any suggestion that Pfizer’s vaccine timeline was politically motivated. In September, Pfizer was the driving power behind a pledge by 9 vaccine firms to “stand with science” and never put ahead something that had not been correctly vetted. Earlier this month, he published an open letter to employees that mentioned he “would by no means succumb to political stress” and expressing disappointment that “we discover ourselves within the crucible of the U.S. presidential election.”

Pfizer is one among 4 firms testing a coronavirus vaccine in late-stage scientific trials in the USA, and it has been the most aggressive in its timeline estimates. Moderna, AstraZeneca and Johnson & Johnson have mentioned that later within the yr is extra probably, matching the predictions of federal well being officers. (AstraZeneca and Johnson & Johnson’s trials have been paused for potential safety concerns, which may additional delay their outcomes.)

In interviews, Mr. Bourla has mentioned that he expects a “conclusive readout” by late October, with an software for emergency authorization that could possibly be filed “instantly.”

Pfizer’s trial of 44,000 volunteers checks the vaccine by giving one group the vaccine, one other group the placebo, and ready till a sure variety of individuals change into contaminated with the virus. If considerably extra individuals who obtained the placebo bought contaminated, then the vaccine is taken into account to be efficient.

An organization spokeswoman mentioned final month that Pfizer wouldn’t be wherever close to completion of its trial by the top of October and that when Dr. Bourla had referred to a “conclusive readout,” he meant it was doable the surface board of specialists monitoring the trial would have by that date discovered promising indicators that the vaccine works.

In his assertion on Friday, Dr. Bourla acknowledged these timelines have been unsure. “Since we should await a sure variety of circumstances to happen, this information might come earlier or later primarily based on modifications within the an infection charges.”

He additionally mentioned the corporate would launch the outcomes of any choice by the surface panel — good or dangerous — inside just a few days of its choice.

Dr. Bourla’s assertion arrived quickly after the F.D.A. printed new pointers detailing how the company would consider a vaccine for emergency authorization, a doc published after weeks of stalling by the White Home. The rules, which don’t carry the power of legislation, name for gathering complete security information within the last stage of scientific trials earlier than an emergency authorization may be granted.

In a tweet on Oct. 6, Mr. Trump accused the F.D.A. of getting a political agenda with the suggestions, which he mentioned “make it tougher for them to hurry up vaccines for approval earlier than Election Day.” Mr. Trump referred to as it a “political hit job.”

In a video he posted from the White Home a day later, Mr. Trump said {that a} vaccine ought to be out there earlier than the election, “however frankly, the politics will get concerned.”

“They need to play their video games,” he mentioned. “It’s going to be proper after the election.”

Jonathan Martin contributed reporting.

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