Reinfection COVID-19 A new study shows that it is 90% less likely to lead to hospitalization or death than a primary infection.
Of the 353,326 people who tested positive in Qatar between February 2020 and April 2021, a total of 1,304 were confirmed to be re-infected. The analysis excluded 87,547 vaccinated people.
Only four of the reinfections were severe enough to lead to acute hospitalization. There was no need to enter the ICU and no death. Of the primary infections, 28 were admitted to the ICU and 7 died.
Studies published in New England Journal of MedicineConcludes that reinfection is not only milder than the initial infection, but is much less likely to lead to hospitalization or death.
Reinfection was defined as the first positive swab obtained at least 90 days after the initial diagnosis of Covid-19.
The majority of reinfections were caused by beta mutants. Beta mutants are more effective than other mutations in avoiding the body’s immune response.
Researchers also found that the median time between the first and second infections was about 9 months.
The first wave of infection in Qatar occurred between March and June 2020, after which 40% of the population had detectable antibodies against Covid-19.
The country then experienced a series of waves caused by alpha and beta variants from January to May 2021.
Based on their results, scientists suggested that Covid “can adopt a benign infection pattern when endemic.”
But they warned. “… Protection against serious illness during reinfection lasts longer, as does immunity against other seasonal” cold “coronaviruses that induce short-term immunity against mild reinfection. You need to determine if. But long-term immunity to more serious illnesses with reinfection. “
David Matthews, a professor of virology at the University of Bristol who was not involved in the study, said the findings show that Covid “finally” as more people recover from being vaccinated and exposed to the virus. Will be like a cold. “
“Your immune system can rely on recent memories of previous victories to defeat the virus when you see it again.
“I’m not sure, but what probably happens is that this virus becomes a common cold virus, like the already common human coronavirus.
“The findings also emphasize that the current pressure on us for hospitalization comes primarily from people who have not yet been vaccinated for some reason.”
Paul Hunter, a professor of medicine at the University of East Anglia, said the paper supports existing evidence that “reinfection is usually not always less severe than the initial infection.”
However, he suggested that it would be difficult to completely determine the severity of reinfection. “It’s often difficult to judge this properly,” he said. “When evaluating based on who came to the hospital, people generally go to the hospital when they get quite sick.
“Reinfection may appear to be of similar severity, because some people are less severe. [who have been reinfected] Please do not go to the hospital. “
“Natural infections seem to provide more durable immunity than vaccines and perhaps better cross-protection against new mutants, but it depends on the extent of the initial infection,” said Professor Hunter. ..
Studies suggest that serious illness due to Covid reinfection is extremely rare.
Source link Studies suggest that serious illness due to Covid reinfection is extremely rare.