Why do some people not catch Covid-19?

Little by little, people who have never been infected with Covid-19 are becoming a minority. In February 2022 in France, between 40 and 50% of the population had already been infected with the virus. On the United States side, a study by the Center for Disease Prevention and Control (CDC) observed that in a random sample, 58% of people contracted the disease at least once.

But who are those who managed to pass between the drops? Or rather, how did they do it? Of course, much of this is down to luck and chance, but scientists are still trying to figure out if there are things that bind these lucky ones together. Quartz attempted to compile them.

First, part of avoiding the virus is how you handled the crisis, says Nicholas Pullen, a biology professor at Northern Colorado University. Wearing a mask, avoiding social interactions and getting vaccinated play into staying healthy.

No quick fix

Although the vaccine is mainly used to reduce the severity of the symptoms suffered in the event of contamination, it can in some cases prevent contamination. A study also suggests that this may be the case when a person has already been infected with a coronavirus other than SARS-CoV-2 before the pandemic.

Overall, our immune system is very complex. Medical liabilities, sleep, diet… No factor is miraculous, but many of them influence our resistance to disease. However, as a study published in the journal Nature explains,the innate immune system is the first defense barrier against SARS-CoV-2“.

Another factor could help escape the virus: genetics. As Quartz explains, certain genetic variables seem to reduce the chances of diseases like tuberculosis, HIV, or the flu.

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It is therefore possible that some people are less able to contract Covid-19 simply because of their genes. A study of couples where only one of the two partners has contracted the virus wishes to verify this theory. If it is correct, however, it is a safe bet that the possible genetic variant is very rare. In the meantime, it is better to keep your mask on.

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