A single dose of Pfizer and BioNtech’s COVID-19 vaccine may considerably scale back the danger of transmission of the virus, a U.Ok. examine has discovered.
Researchers analyzed outcomes from 1000’s of COVID-19 checks carried out every week as a part of hospital screenings of healthcare workers in Cambridge, England.
Mike Weekes, an infectious illness specialist at Cambridge College’s division of medication, who co-led the examine, mentioned: “That is nice information – the Pfizer vaccine not solely gives safety in opposition to changing into ailing from SARS-CoV-2, but in addition helps forestall an infection, lowering the potential for the virus to be handed on to others.
“However now we have to keep in mind that the vaccine doesn’t give full safety for everybody.”
The examine additionally discovered a single dose of the shot cuts the variety of asymptomatic infections.
“Our findings present a dramatic discount within the charge of optimistic screening checks amongst asymptomatic healthcare employees after a single dose of the Pfizer-BioNTech vaccine,” mentioned Nick Jones, an infectious ailments specialist at Cambridge College Hospital, one other co-lead on the examine.
After separating the check outcomes from unvaccinated and vaccinated workers, Jones’ staff discovered that 0.80% of the checks from unvaccinated healthcare employees have been optimistic.
This in contrast with 0.37% of checks from workers lower than 12 days post-vaccination – when the vaccine’s protecting impact shouldn’t be but absolutely established – and 0.20% of checks from workers at 12 days or extra post-vaccination.
The examine and its outcomes have but to be independently peer-reviewed different scientists, however have been printed on-line on Friday.
This implies a four-fold lower within the danger of asymptomatic COVID-19 an infection amongst healthcare employees who’ve been vaccinated for greater than 12 days, and 75% safety, mentioned Weekes.
The extent of asymptomatic an infection was additionally halved in these vaccinated for lower than 12 days, he mentioned.
Britain has been rolling out vaccinations with each the Pfizer COVID-19 shot and one from AstraZeneca since late December 2020. The U.S. is utilizing the Pfizer-BioNTech shot and a vaccine Moderna Inc. in its vaccination program.
Key real-world information printed on Wednesday from Israel, which has performed one of many world’s quickest rollouts of Pfizer’s COVID-19 vaccine, confirmed that two doses of the Pfizer shot reduce symptomatic COVID-19 circumstances 94% throughout all age teams, and extreme sicknesses almost as a lot.
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