Such long-standing protection makes the likelihood of re-infection very little. 77 people took part in the study of American medics. One month after being infected with Covid-19, they gave blood at intervals of three months. In most of them, mild forms of the disease were observed. Only six of them were hospitalized. Bone marrow samples were taken from 19 patients about 7-8 months after they were infected. Four months later, four of them gave a second bone marrow sample.
As expected, the levels of antibodies in the participants' blood dropped rapidly in the first few months after infection. Then they leveled out. Although information has emerged in the media that the quantities of antibodies decrease after infection, this is not related to the patient's weaker immunity. In his body, cells are left capable of producing antibodies against SARS-CoV-2. Scientists found that these cells, referred to as plasmatic, were present in people's blood 11 months after they were infected. They migrate into the bone marrow, where they constantly release antibodies into the blood, providing protection against new infection.
Researchers suggest that people who have spent asymptomatic Covid-19 may also have long-time immunity. It is yet to be established whether patients who have experienced severe forms
covid-19 can be protected from reinfection by the coronavirus.
Medics proved long immunity after a mild form of COVID-19
American scientists at the University of St. Louis have proved that after a mild form of Covid-19, immune cells remain in the body that can produce antibodies against the coronavirus throughout life, writes the magazine. “Natcher,” quoted by BTA.tags:
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