Do we have immunity to the new coronavirus?

Sooner or later the country will begin again to let the citizens of other countries once closed the border because of the risk of the spread of coronavirus. But how to prevent a repeat of the epidemic? So far, the countries themselves decide how to prevent coronavirus — at Vienna airport, for example, need to show a certificate stating that the person is not sick (or already had) a coronavirus. If there is no such document, the rapid test offered to surrender on the spot (have to wait up to 3 hours and is almost 15 000) or to sit on a two-week quarantine. As will be realized recently, is not yet clear. Not the most efficient way, especially when you consider how many people visit the same airport in London for the day. This will entail long queues on the control and increase the risk of Contracting coronavirus.

Therefore, some States consider the introduction of a so-called “immune passports”. They will issue based on the results of tests for antibodies to the coronavirus. The logic of the legislators, if the person is already infected with a virus, it has antibodies to it, he could infect anyone else and he snaps again. So it can move around the country freely. However, the studies show that despite the fact that the chance of re-infection with coronavirus is minimal, it is still there.

Can I re-infected with coronavirus?

For example, 3 weeks ago, doctors from South Korea reported that the detected particles of the coronavirus in the blood of people who already are ill — thought antibodies had completely suppress it and prevent re-appearance of the particles. These people were considered cured, tests showed no virus. And then — this?

This can be explained in two ways: either the patients do re-contracted the coronavirus, or an error occurred testing. South Korean scientists believe that the latter option is more likely, because the test found are not full of virus particles and their “stuck” fragments, which have not got the antibodies. However, this proves that the residues of coronavirus can persist in the body for a long time after recovery.

According to the latest data, some people find particles of coronavirus in the body even after 2 months after they had been ill. This casts doubt on the requirement of a two-week quarantine in most countries. However, as shown by study, after 2 months, despite the presence of the particles of the coronavirus, patients were no longer infectious. Doctors even tried to highlight and cultivate the viral particles from several such patients, but they did not work. It also suggests that complete viral particles in their body was gone. And the re-emergence of symptoms they associated with the fact that the immune system just “finished” the remains of the virus.

Replacement of the epithelium (surface cells) of the respiratory tract occurs approximately 3 months. Therefore, the remains of the coronavirus can be observed even in ill patients.

Immunity to coronavirus

While there have been no reports unambiguously confirmed case of re-infection with coronavirus. Scientists even tried to test this theory on the monkeys and tried again to infect SARS-CoV-2 has been ill macaques. Antibodies developed after the first illness, it worked, that is, the monkeys developed immunity to COVID-19.

The question is — how long will this acquired immunity? Whether it can after some time become weaker and the person infected with coronavirus again? Who saysthat ill people with antibodies are not immune from re-infection.

Research suggests that acquired immunity works differently depending on the type of infection. For example, the human body remembers the measles virus for life, so it is enough to inoculate a child in order not to get sick. But the flu can recover in one season a few times — infected by different strains. Since the coronavirus SARS-CoV-2 appeared recently, long-term observations of the immunity of the person who had the virus, yet.

If you look at the example of the flu, this virus is very changeable, and every year we meet a new strain, so the body now knows how to fight the flu, and six months have not. SARS-CoV 2 is also able to change and evolve, but so far scientists believe that the speed with which it mutates ten times lower than seasonal influenza.