A single dose of the Oxford / AstraZeneca or Pfizer / BioNTech vaccines, currently administered in the UK, reduced the rate of coronavirus infections by around 65%, according to a new UK study on Friday.
A combination of two studies from the University of Oxford and the Office of National Statistics (ONS), which have yet to be published, also found that a single shot of the two-dose vaccines protected older and more vulnerable people almost as much as children. Young people. and healthier individuals.
The results indicate a promising effect on hospitalizations and deaths from COVID-19 infections after vaccinations. But researchers warn that vaccinated people could still be reinfected and trigger an asymptomatic spread of the deadly virus, making the need for social distancing and face masks still crucial.
The researchers analyzed the COVID-19 test results of over 350,000 people in the UK between December 2020 and April 2021 and found that 21 days after a first shot, the time it takes for the immune system to get a decent response, the new infections since COVID-19 have decreased.
The odds of new SARS-CoV-2 infection were reduced by 65% in those = 21 days after the first vaccination with no second dose compared to unvaccinated individuals with no evidence of previous infection, the study noted.
In those vaccinated, the greatest reduction in odds was seen after the second dose (70-77%). There was no evidence that these benefits varied between the Oxford / AstraZeneca and Pfizer / BioNTech vaccines, he added.
Researchers, in the large community surveillance study, conclude that vaccination with a single dose of Oxford / AstraZeneca or Pfizer / BioNTech vaccines, or two doses of Pfizer / BioNTech, significantly reduced the new SARS-CoV-2 [Covid-19] infections.
Greater reductions in symptomatic infections and / or infections with a higher viral load are reflected in reduced hospitalization / death rates, but highlight the potential for limited ongoing transmission from asymptomatic infections in vaccinated individuals, read the conclusions.
The second study, of nearly 46,000 adults who had been vaccinated with one dose, found strong antibody responses, a sign that vaccines stimulate the body’s defense system to protect itself from the virus in all age groups. These antibody responses were “largely sustained up to 10 weeks later,” the researchers said.
“We still don’t know exactly how much antibody response and how long it takes to protect people from getting Covid-19 in the long term, but in the coming year, the information from the survey should help us answer these questions,” said Professor Sarah. Walker, chief investigator of the studies, of the University of Oxford.
Both studies are based on data from the Covid-19 Infection Survey, a partnership between the University of Oxford, the ONS and the Government Department of Health and Social Care (DHSC).
The results will be a boost for the UK’s vaccination program, which is moving forward quickly with a goal of covering all adults by the end of July on track. The National Health Service (NHS) said this week that its vaccination program has now protected around 28 million people in England with at least one shot and delivered more than 9 million seconds of dose.
“We are seeing a record number of patients coming forward for their second doses of Oxford / AstraZeneca. People are voting with their feet, showing strong public support for the NHS covid vaccination campaign which has already saved over 10,000. lives, “said Sir Simon Stevens, Chief Executive of the NHS.
In April, the NHS said it focused on second doses, but appointments are still available for those in initial priority groups who may still need the first doses.
Anyone aged 45 and over can still arrange their own jab, as can people who are clinically vulnerable or a healthcare professional, who should contact their primary care physician (GP) for an appointment, the NHS said.
It also invites those entitled to a jab by letter and text, with some primary care physicians personally calling unvaccinated patients to encourage the intake.
Doctors, nurses and other health professionals are distributing vaccines at more than 1,600 sites ranging from cathedrals, mosques and temples to racecourses, sports stadiums, cinemas and museums, with more than 20 offering the modern jab in the past week.
(This story was not edited by NDTV staff and is automatically generated from a syndicated feed.)