Covid reinfection ‘highly unlikely’ for at least six months, Oxford study says

Residents undergo a free rapid antigen nasopharyngeal swab test for Covid-19 at a testing facility set up in a school sports hall, on November 20, 2020 in Bolzano, South Tyrol, Northern Italy.


LONDON — People who have contracted the coronavirus are highly unlikely to contract the disease again for at least six months, according to the findings of a new study.

Researchers say the findings are “exciting” because they represent an important step in understanding how Covid-19 immunity may work.

The study, published Friday, was part of a major collaboration between the University of Oxford and Oxford University Hospitals NHS Foundation Trust.

It claims to be the first large-scale research project of how much protection from reinfection people get after contracting the coronavirus. The study has not yet been peer-reviewed.

It comes after a string of encouraging vaccine results over the past couple of weeks following promising late-stage trial readouts from PfizerBioNTech and Moderna, as well as positive phase two results from AstraZeneca-Oxford.

There is growing optimism that a coronavirus vaccine could help bring an end to the coronavirus pandemic that has claimed over 1.3 million lives worldwide.

Public health officials and experts have warned it could take months, maybe even more than a year, to distribute enough doses of any prospective coronavirus vaccine to achieve so-called herd immunity and suppress the virus.

‘Really good news’

Researchers said there was not yet enough data to make a judgement on protection from the initial infection beyond a six-month period. The study would continue to collect data, with the hope of verifying how long protection from reinfection can last.

“This is an exciting finding, indicating that infection with the virus provides at least short-term protection from re-infection — this news comes in the same month as other encouraging news about COVID vaccines,” said Dr. Katie Jeffery, director of infection prevention and control for Oxford University Hospitals.

A previous study of staff at Oxford University Hospitals NHS Foundation Trust, published on Nov. 5, found antibodies to Covid-19 fall by half in less than 90 days.

That study, which has also not yet been peer-reviewed, said antibody levels peak lower and fall faster in younger adults.

“We know from a previous study that antibody levels fall over time,” Eyre said, referencing the research published earlier this month.

“But this latest study shows that there is some immunity in those who have been infected. We will continue to follow this cohort of staff carefully to see how long protection lasts and whether previous infection affects the severity of infection if people do get infected again.”

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