A (39), an office worker, had his child (7) undergo a corona test following showing typical symptoms of COVID-19 infection, such as sore throat and runny nose. The result was positive. Mr. A, who has not yet had a history of corona infection, thought that she would soon become infected as well, but she did not test positive even though she conducted rapid antigen tests every day for a week in a row.
Like Mr. A, there are cases in which the person does not become infected even if there is a confirmed case of Corona 19 in the family. Although the Corona 19 virus is a virus that spreads well in the air, why does it not spread between people living in the same space?
Virologists and immunologists believe that vaccination will have a major impact in the first place. “When exposed to the virus, the immune system works much faster in the vaccinated than in the unvaccinated,” said Gigi Gronval, a professor of environmental health at Johns Hopkins University in the US.
If the immune response occurs quickly, it can prevent the spread of the virus in the body. Professor Gronval explained that this is the reason for the existence of vaccines. It makes the immune system work first before the invading virus replicates and spreads out of control.
If you have a high level of vaccine antibody, you can quickly defend once morest exposure to the virus, so there is no chance of getting sick.
Because of this, some experts describe it as ‘super immunity’. It is explained that people who have been exposed to a virus with high genetic similarity to the Corona 19 virus through a cold or the like have immunity to the virus, so they show excellent defense and attack ability once morest similar Corona 19.
In addition, cases where people pay attention to wearing a mask at home, indoor ventilation, and quarantine life also greatly reduce the possibility of exposure to the virus.
There are people who show symptoms of coronavirus and are suspected of being infected, but there are people who repeatedly test negative because of the limitations of the rapid antigen test. Although the rapid antigen test was approved with a sensitivity of 90% and a specificity of 99%, it is confirmed that the ratio of positive and negative determinations is lower than that of permission in reality, not in a laboratory.
By Moon Se-young, staff reporter [email protected]
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