The Pfizer and Moderna vaccines proved to be 92 percent effective with just the first dose

Only one dose of the modern and Pfizer two-dose coronavirus vaccines is almost as good.

In a study published on Thursday in the New England Journal of Medicine, two Canadian researchers suggested an amendment to the determined effectiveness of Pfizer vaccines after just one injection. While Pfizer and BioNTech reported that their vaccine was only 52.4 percent effective in preventing infection after the first dose, the researchers noted that this data includes results in the first two weeks after inoculation, “when immunity would still be increasing “. After two weeks, this effectiveness increased to 92.6 percent, equaling the effectiveness of the first 92.1 percent dose reported with the Modern vaccine as well. After two doses, the Pfizer vaccine is 95% effective and the Modern vaccine is 94%.

Canadian researchers’ interpretations of Pfizer results led us to suggest in the letter that vaccine distributors are slow to give people a second dose. This would allow distributors to get the first doses to more people at risk, rather than leaving them “completely unprotected” – something the researchers called “a national security issue that, if ignored, will certainly result in thousands of hospitalizations related to COVID-19 and deaths this winter in the United States. “

Another January study prompted Pfizer and BioNTech to say on Wednesday that they are unsure whether the vaccine will be effective in protecting against variant B.1.351 found for the first time in South Africa. The study published in the New England Journal of Medicine found that the vaccine was still able to neutralize the virus within the B.1.351 strain, and that tests have not shown that the variant reduces the protection of the vaccine in people. Even so, companies may end up creating a booster injection to ensure that the vaccine remains effective against the highly transmissible strain.

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