Coronavirus reinfection: Can I get Covid-19 twice?it’s complicated

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said this week health officials are beginning to see “many cases” reported as reinfections.

“A well-documented case,” he said. “After a relatively short period of time measured somewhere in the infected people weeks or months, they come back, are exposed and re-infected.”

“So you really have to be aware that you’re not completely’immunized’,” Forch said.

In August, a 25-year-old Nevada man said a doctor The first recorded case of Covid-19 reinfection in the United States. The man was first diagnosed with Covid-19 in April and was virus-positive more than a month after he got better and was negative twice.

Another team of researchers reported in August A 33-year-old man living in Hong Kong had Covid-19 twice This year: March and August.

And earlier this year An 89-year-old Dutch woman, also suffering from rare white blood cell cancer, died after catching Covid-19 twice., The expert said. She became the first and only known person to die after reinfection.

Although it is possible to get the virus again, there are still questions scientists are trying to answer, such as who is likely to be re-infected and how long the antibody protects people from another infection.

Scientists Study of antibody duration

Several new reports published recently Covid-19 immunity has been shown to last for months.

Researchers at the University of Arizona have found that antibodies that prevent infection can last at least 5-7 months after Covid-19 infection.

In a pandemic under the age of one, it can take some time for scientists to get a clear image of immunity.

“However, we know that people infected with the first SARS corona virus, the virus most similar to SARS-CoV-2, remain immune 17 years after infection. If SARS-CoV-2 is like the first, one expects the antibody to last for at least two years and is unlikely to be much shorter. “

Other studies from Massachusetts and Canada supported the idea of ​​long-term immunity.

This suggests that “if the vaccine is properly designed, it can elicit a durable antibody response that helps protect vaccinated individuals from the virus that causes COVID-19. “We do,” said Jennifer Gomermann, a professor of immunology at the University of Toronto.Said In the statement..

The question is how the second infection affects the Covid-19 vaccine. Men in Nevada experienced more serious symptoms during the second infection, while men in Hong Kong had no obvious symptoms during reinfection.

“The effects of reinfection may be related to vaccine development and application,” he said. Recent research on Lancet..

Disease severity can affect antibodies

There is something else that researchers have begun to notice: People who are ill and have more severe seizures tend to have a stronger immune response.

“There are differences between asymptomatic people with very mild infections, and there seems to be a slightly higher number of people who do not have detectable antibodies,” says WHO’s Swaminasan. “But almost everyone with moderate to severe illness has antibodies.”

Bhattacharya, Arizona, repeated the discovery.

“People sampled from the ICU had higher levels of antibodies than those with mild illness,” he said, adding that he still doesn’t know what that means for long-term immunity.

CNN’s Maggie Fox contributed to this report.

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