Pfizer Vaccine May Reduce Transmission After 1 Dose, New Study Finds


A single dose of the COVID-19 vaccine manufactured by the pharmaceutical company Pfizer PFE,
+ 0.21%
and its partner BioNTech BNTX,
-1.61%
reduces infections and reduces the risk of transmission, according to a new study.

A study conducted by the University of Cambridge Hospitals National Health Service Foundation and the University of Cambridge examined healthcare workers in January, examining a similar number of vaccinated and unvaccinated staff.

It found that 26 of 3,252, or 0.8%, tested positive for unvaccinated healthcare workers. This compares with 13 out of 3,535, or 0.37%, tests by healthcare workers less than 12 days after vaccination, and four out of 1,989, or 0.2%, tests by healthcare workers at 12 days or more after vaccination. vaccination.

“This is great news: the Pfizer vaccine not only provides protection against the SARS-CoV-2 disease, but it also helps prevent infection, reducing the chance that the virus will be transmitted to other people,” said Dr. Mike Weekes, a disease specialist, who led the study.

This suggests a four-fold reduction in the risk of asymptomatic COVID-19 infection among healthcare workers who have been vaccinated for more than 12 days, the researchers said, with the level of infection cut in half for those vaccinated less. 12 days. The study has not been peer reviewed.

The Pfizer – BioNTech vaccine is given in two doses. In the US, the interval between doses is three weeks, while in the UK the interval is up to 12 weeks.

A growing body of evidence shows how effective the Pfizer-BioNTech vaccine has been in the UK and Israel, two of the countries that lead in mass vaccination.

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