We passed COVID-19, but how long does natural immunity last?

Can you still get sick by Ovidius? It's the question that resounds without a final answer, from the beginning of the pandemic. Studies on developed immunity after facing other coronarys suggest a transitional protection, destined to fade over time. Several studies that have been followed in time by people recovered from Ovid-19 have confirmed the presence of an immune “immune” of SARS-CoV-2 even months after the original infection.

This last study line published in )Science has measured for months the concentration of antibodies and other immune cells to over 180 American patients recovered from Coved. According to the study, the patient's immune response to the virus remained measurable until 8 months after the initial showing of symptoms.

The discovery is particularly interesting for two reasons. The first is that 93% of the monitored patients were affected by the disease in a slight form. The possibility that even those who return from less serious infections can develop long - term immunity is the one about which the greatest doubts are circulated.

The second is that various components of the immune system were considered in analysis, and each showed a different trend over time.

Scientists from the University of San Diego, California and Icahn Medical School in Mount Sinai, New York, have studied the humoral response (which includes the production of antibodies) and the intermediation of cells (what happens through B and T lymphocytes) in a total of 254 blood samples collected from 188 patients between 6 days and 8 months from the first symptoms of the cod. Among these samples, 43 gathered after 6 months and beyond the beginning of the infection.

Antitrusions in response to the SARS-CoV-2 choreography, including those directed against the components of the epic protein, began to show a slight decline between 6 and 8 months of symptoms showing. T lymphocytes, tasked with neutralising infected cells, were slowly reduced over time to half, of 3-5 months. Cells B, responsible for producing more antibodies in response to the known virus, grew progressively. They were more abundant after six months than after the first month of symptoms.

Although it is not possible to draw direct conclusions from the study because immune defense mechanisms against SARS-CoV-2 has yet to be determined exactly, “results show that sustainable immunity to a second SARS- CoV-2 infection is an opportunity for most people “.

Conclusions are only about natural immunity, which differs from person to person, because it relates to the characteristics of the immune system, rather than the one offered by vaccines, for the duration of which there is actually no correct information.