Covid-19: Scientists try to understand why not everyone takes it
During the two years of the pandemic, many people managed to avoid becoming infected with Covid-19 compared to others. We have all wondered why this happens and what the fact that some people are immune to the virus depends on. Exactly how they do this remains a mystery, but scientists are starting to find some clues. The hope behind this is that of develop some drugs that are effective in blocking the spread and transmission of Covid-19.
Perhaps it was due to the reflex of the immune system which quickly interrupted an embryonic infection. In previous studies with other viruses, we have seen early immune responses in the nose associated with resistance to infections. These imply that it exists a struggle between the virus and the host which in uninfected patients results in prevention of the take-off of infection.
Covid-19, many have been found resistant to the virus
Some of them also have reported some mild symptomssuch as stuffy nose, sore throat, tiredness or headache, although, as these commonly occur in everyday life, may not be related to exposure to the virus. In any case, the levels of the virus have not risen high enough to trigger detectable levels of antibodies, T cells, or inflammatory factors in the blood that are usually associated with symptoms. Further studies have suggested that it is possible to pass Covid-19 during the initial stages before it establishes a foothold. In the first wave of the pandemic, a group of health workers, exposed to the virus firsthand, were examined and monitored.
Their blood tests showed that about 15% of them had Sars-CoV-2 reactive T cells, in addition to other markers of viral infection. IS It is possible that T of memory from previous coronavirus infections, i.e. those responsible for common colds, have cross-reacted with the new coronavirus and have protected from Covid-19. Additionally, there is no commercially available test that can differentiate between vaccination-triggered immunity and the different variants, so unless a person has tested positive recently, it is almost impossible to know whether or not she was exposed to Omicron.
Seasonal coronaviruses may not be the only source of cross-protective immune responses. A study investigated this possibility in Sweden after the country took a light approach to restrictions. The results suggested that this pattern of infections could only be explained if a large percentage of people had some kind of protective immunity. The identification of these genes could lead to the development of new treatments for Covid-19. Most of those who have avoided Covid are thought to be unlikely to be genetically resistant, even if they have partial immune protection. This means that there is no guarantee that they will not eventually get infected.
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