Half Of People Without COVID-19 Have Cells That Can Protect Them From Disease

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Half Of People Without COVID-19 Have Cells That Can Protect Them From Disease
Half Of People Without COVID-19 Have Cells That Can Protect Them From Disease

Video: Half Of People Without COVID-19 Have Cells That Can Protect Them From Disease

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Video: COVID-19: Science and the Public Health 2023, January
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Half of people without COVID-19 have cells that can protect them from disease

New evidence has confirmed that those who have undergone COVID-19 develop long-term immunity. In half of the people who were not infected with the new SARS-CoV-2 coronavirus, scientists also found immune cells that respond to it.

Half of people without COVID-19 have cells that can protect them from disease
Half of people without COVID-19 have cells that can protect them from disease

Photo: CC0 Public Domain

The new study, published in Cell, has provided early new evidence that humans develop long-term immunity against the novel SARS-CoV-2 coronavirus. In addition, about half of people who have not had COVID-19 have cells in their blood that can potentially protect against it. But this work does not provide evidence that coronavirus infection cannot be re-infected.

The authors of the scientific work performed blood tests on 20 former patients who recovered from COVID-19. All participants in the study, scientists found CD4 + cells that were "tuned" to the SARS-CoV-2 coronavirus, 70% had CD8 + cells. Antibodies against the virus were found in each patient.

CD4 + cells, also known as helper T cells, are a type of lymphocyte required to activate other cells in the immune system when responding to an infection. Among the cells that they activate are B-lymphocytes that produce antibodies. CD8 + cells destroy cells in the body that are infected with viruses.

These data reinforce the results of recent work, which confirmed the presence of antibodies against coronavirus in almost all patients.

Scientists also found that many people who did not have COVID-19 (in the study it was a control group) have cells that can potentially protect them from the new coronavirus. In 40-60% of people who donated blood in 2015-2018, scientists have found CD4 + cells capable of responding to the new coronavirus. They were likely formed during the common cold caused by other, less dangerous, coronaviruses.

More research is needed to find evidence that these immune cells offer complete protection against COVID-19 or help the body fight the disease, the authors say. Their results are consistent with a new study in which antibodies from a person who had “SARS” neutralized the novel SARS-CoV-2 coronavirus.

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