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How long do you stay immune after being sick in Corona?
We hear about more and more people finding themselves infected with corona for the second time, and so far - 10 months into the corona outbreak - it is not yet known for how long patients develop immunity.
Harvard researchers have an answer
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Thursday, October 15, 2020, 11:10 AM
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We tend to think that someone who has already been in Corona will not get sick again, but the truth is far from it, and more and more evidence shows that re-infection is entirely possible, and may even be more fatal.
A new study from Harvard found that people who recover from COVID-19 may have protective antibodies only up to four months after becoming ill.
Researchers from Harvard Medical School and Massachusetts General Hospital have tried to determine how long immunity lasts in those who have recovered from the corona virus, and whether those infected with COVID-19 will develop ongoing protection against the virus.
The study, published in Science Immunology, also focused on the body's immune response to COVID-19 and the team's findings suggested that antibodies could be an accurate tool for monitoring the spread of infection in the community.
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The study found that the immune system produces antibodies in response to SARS-Cov-2 - the virus that causes COVID-19.
However, Dr. Rachel Charles, the senior author of the article, said that there is a "large knowledge gap" in terms of the duration of response of these antibodies.
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The study examined blood samples from 343 patients with COVID-19, most of whom had a severe illness, up to four months after the onset of symptoms.
The results were compared to blood samples from more than 1,500 people taken before the plague.
The researchers said IgG antibody levels capable of neutralizing the virus remained high in infected patients for up to four months.
How long do the antibodies really last?
Serological tests in Israel (Photo: Reuven Castro)
"This means that people are very protected for this period of time. We have shown that major antibody responses to COVID-19 do persist," Dr. Charles told Harvard Gazette. 19 for at least 14 days.
Essential knowledge
The study also found that people infected with SARS-CoV-2 had immunoglobulin A (abbreviated IgA) and immunoglobulin M (or IgM) - antibodies that the body produces when it fights a new infection.
These responses were relatively short and dropped to low levels in about two and a half months or less, on average.
"We can now say that if a patient has IgA and IgM reactions, they are likely to have been infected with the virus in the last two months," said Dr. Charles.
Dr. Jason Harris, one of the study's senior authors, explained that The immunity of these antibodies could help scientists obtain more accurate data about the spread of SARS-CoV-2.
"Knowing how long an antibody response lasts is essential before we can use antibody tests to track the spread of COVID-19 and identify 'hot spots' of the disease," he said.
Scientists are still unsure whether antibodies provide guaranteed immunity to the virus.
They fear that when patients overcome the disease, they will not necessarily be immune to different strains of the virus, and that the antibodies they have for the strain to which they are infected may not last more than a few months.
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