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Pfizer vaccine effective 6 months later, companies say

Published: Apr. 1, 2021 at 7:32 AM EDT|Updated: Apr. 1, 2021 at 7:51 AM EDT
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(Gray News) - The Pfizer and BioNTech vaccine is highly effective six months after the second dose, the companies said in a news release on Thursday.

Their ongoing studies show the vaccine was 91.3% effective against COVID-19 from seven days through up to six months after the second dose.

The pharmaceutical company has been studying the vaccine in more than 46,000 volunteers.

Among that group, 77 people who were vaccinated tested positive for COVID-19. None of them exhibited severe disease as defined by the Centers for Disease Control and Prevention.

Pfizer says this makes its vaccine 100% effective against what the CDC calls severe disease and 95% effective by the Food and Drug Administration’s definition.

Previous estimates indicated protection lasts at least 90 days.

Pfizer’s ongoing Phase 3 trials also appear to show the vaccine provides full protection against the B.1.351 variant of the virus, commonly referred to as the South Africa variant.

In a study of 800 participants in South Africa, nine people got COVID-19, all of whom were in the placebo group.

“The high vaccine efficacy observed through up to six months following a second dose and against the variant prevalent in South Africa provides further confidence in our vaccine’s overall effectiveness,” said Albert Bourla, chairman and CEO of Pfizer.

Pfizer and BioNTech plan to offer their data for scientific review in the near future.

In addition, the vaccine was found to be highly effective in South Africa, where a contagious variant is widespread.

Copyright 2021 Gray Media Group, Inc. All rights reserved. CNN Newsource contributed to this report.