One of the biggest questions between the COVID-19 pandemic is why the virus kills some people and leaves others without any symptoms. Now, six months after the pandemic, we finally get some responses. Based on Anthony Fauci, MD, director of the National Institute of Allergy and Infectious Diseases (NIAID), if you are known to the common cold year after year, you may have some protection against the new coronavirus, thanks to the T cells in your immune system..
“If you look at [your immune system] Fauci told McClatchy in a recent interview that it is an army with different levels of defense, antibodies that prevent the virus from entering. So that’s like the first line of defense, “Fauci told McClatchy in a recent interview. T cells go in and kill the infected cells or stop them.”
Most research on COVIDs “has focused entirely on antibody testing,” Fauci said, but according to him, T cells are “an equally important component of the immune system.”
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Because COVID-19 is a new type of coronavirus, it was initially believed that your T cells wouldn’t be able to detect it. It is thought that T cells are found only in people who already have COVID-19. But a new NIAID study was published in the journal Science by August 4, it was found that up to 50 percent of people who have not been exposed to coronavirus have T cells needed to fight the virus. Similarly, a German study is published in the journal nature at the end of July, 68 healthy people not exposed to coronavirus were considered. Of these, 35% have T cells in the blood that are needed to attack a new type of coronavirus.
According to the results of this new study, experts believe that healthy people may have produced these T cells when fighting similar coronavirus-related infections in the past, like the common cold. . And the more recently an individual became infected with another coronavirus, the more likely they were to have some protection from COVID-19, Fauci told McClatchy.
“It’s like a one or two punch,” he said. “Imagine that the T cells you created to react a few years ago – three, four, five years ago – when you were exposed to a relatively benign coronavirus that caused the common cold. , there may actually exist, and when you are exposed to SARS-Coronavirus-2, there may be some degree of protection, “he said.
Acting as a secondary line of defense in the immune system when antibodies fail or disappear, T cells also last much longer than antibodies. So if you’ve read those startling reports that antibodies don’t exist – as a July UK study found that COVID antibodies were reduced after just three weeks from inception. infection – don’t worry. These reports ignore the role of T cells, which are equally important, according to Fauci and other experts.
Amesh AdaljaMD, senior scholar at the Johns Hopkins University Medical Security Center, told CNN that pre-existing T cells could also help us understand why COVIDs affect people differently. together.
“If you could compare people who could have a serious and mild illness and try looking at T cells in those people and say, ‘People with a serious illness are less likely to have T cells cross reactive.’ Can people with mild illness have more cross-reactive T cells? ‘I think that hypothesis is biologically plausible,’ he said. “It is clear that even though the presence of T cells does not prevent people from getting infected, does it regulate the severity of the infection? That’s what it could be.” And to know more about this, see Here’s why COVID kills some people and others with no symptoms, the study says.
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