Reinfection of Covid-19 is rare, but common in people over the age of 65.

A team of scientists, including part of the Danish Department of Infectious Disease Epidemiology, said most people infected with Covid-19 appear to be protected from reinfection for about six months. However, when we looked at who was infected again, most were over 65 years old.

They examined the reinfection rate of 4 million people during the second surge of Covid-19 from September to December 31, and compared this to the infection rate during the first surge from March to May. I compared. Of the 11,068 people who tested positive during the first surge, only 72 responded positive again the second time.

The team wrote that older age groups had only about 47% protection against recurrent infections, compared to younger people who appeared to have about 80% protection from reinfection. This finding is not entirely unexpected, as the immune system weakens as people grow older.

“Given that it is at stake, the result is that people, even if they are already infected with COVID-19, can comply with the measures taken to keep themselves and others safe. It emphasizes how important it is, “the Danish Institute said in a statement.

“That’s a huge difference,” said Dr. Amy Edwards, an infectious disease specialist at a university hospital in Cleveland who wasn’t involved in the study.

“I think it really emphasizes how important it is to ensure that everyone over the age of 60 is vaccinated, with or without Covid, to protect them from future infections.”

In a commentary that accompanied the study, immunologist Dr. Rosemary Boyton and Imperial College London’s Daniel Altman called the difference in reinfection rates “relatively alarming.”

“Generally, protection from reinfection is only 80%, down to 47% for people over the age of 65, which is more of a concern than the numbers provided in previous studies,” they write. SARS-CoV-2 may be out of our reach with the hope of protective immunization from natural infections, and a global vaccination program with high-efficiency vaccines is a permanent solution. “

Researchers analyzed Danish test data, including 10.6 million coronavirus tests performed by about 4 million people, or about 69% of the country’s population.

They examined the reinfection rate during the second surge of Covid-19 from September to December 31 and compared it to the infection rate during the first surge from March to May. Of the 11,068 people who tested positive during the first surge, only 72 responded positive again the second time. In total, it accounts for less than 1% of infected people.

However, 3.6% of people over the age of 65 were re-infected in the second wave.

This is not unexpected because of what is known as immune aging, the gradual deterioration of the immune system with age.

“There is reason why people over the age of 60 must get additional vaccines to boost their immunity to various infections, as we know that the immune system will begin to decline in later life.” Said Edwards.

One of the nice things about mRNA vaccines like Pfizer and Modana is that they seem to overcome some of the concerns of immune aging because they produce such strong protection.

“I’m still not sure if people need to get a booster, but it would be interesting to see it and see how it works,” Edwards said.

This study is consistent with before the study.. Other studies have shown that reinfection rates are less than 1% and immunity can last 5 to 6 months after Covid-19 infection.

One of the limitations of this study is that the infection was examined before many variants circulated, so it is unclear what effect it will have on reinfection rates. This is something scientists have to consider in the future.

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