Vaccine protection is stronger for those previously infected with coronavirus, research finds

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Vaccine protection is stronger for those previously infected with coronavirus, research finds

  • Those previously infected with the coronavirus are better protected by the Pfizer vaccine
  • Antibody levels against South African and Brazilian variants are 15 times higher
  • The study took blood samples from 237 vaccinated NHS workers ages 22 to 71

Vaccines may work better in people who have already had Covid – and can protect more effectively against the South African and Brazilian variants.

Those previously infected with coronavirus produced nearly seven times as many antibodies after a single Pfizer shot compared to people who haven’t had the virus.

Their antibody levels against the South African and Brazilian variants were also 15 times higher, a study shows. And they had seven times more T cells – the vital immune cells that respond to the virus.

Those previously infected with coronavirus produced nearly seven times as many antibodies after a single Pfizer shot compared to people who haven't had the virus.  In the photo, a health professional is preparing a dose of the Pfizer vaccine

Those previously infected with coronavirus produced nearly seven times as many antibodies after a single Pfizer shot compared to people who haven’t had the virus. In the photo, a health professional is preparing a dose of the Pfizer vaccine

Infected people had a level of protection after just one shot that others had to wait for their second shot to reach, the study found.

Co-author Dr Thushan de Silva, from the University of Sheffield, said, ‘Having high T cell and antibody immunity in previously infected people after vaccination can provide a better defense – giving us an advantage in the ongoing battle. between variants and vaccines. ‘

Infected people had a level of protection after just one shot that others had to wait for their second shot to be reached, the study found.  Pictured, the Pfizer vaccine

Infected people had a level of protection after just one shot that others had to wait for their second shot to reach, the study found.  Pictured, the Pfizer vaccine

Infected people had a level of protection after just one shot that others had to wait for their second shot to reach, the study found. Pictured, the Pfizer vaccine

The study took blood samples from 237 vaccinated NHS workers ages 22 to 71.

The antibody level four weeks after the first dose was 6.8 times higher in previously infected people than in uninfected people.

Those who have had Covid still need to be vaccinated because immunity wears off over time. The study, funded by the Ministry of Health, has not yet been published or reviewed.

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