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Australian scientists invented a special way to test immunity using memory cells in the blood of patients who had recovered from “Covid-19”, and the immunity was found to last for a period of at least eight months.
The journal “Science Immunology” stated that since the beginning of the pandemic, scientists around the world have been searching for an answer to a question about the duration of immunity against “Covid-19” and the severity of the infection again. To this end, scientists from Monash University, the Burnett Institute and the Alfred Hospital in Melbourne studied blood samples from 25 patients diagnosed with “Covid-19” for eight months. And the researchers each took a series of “snapshots” of their immune system during the period from day four to day 242 of their illness, and a healthy control group of 36 volunteers was set up to compare the results.
The results showed that the concentration of free antibodies against the “SARS-CoV-2” virus in the blood decreases 20 days after the onset of symptoms of the disease, and this is consistent with the results of previous studies, which indicated that the Antibody level drops rapidly, especially in mild cases of illness.
But the researchers’ task was to determine not just how long the antibodies stayed, but how long the immune system continued to remember the virus.
Antibodies, according to the researchers’ metaphor, are like shells that attack pathogens, and white blood cells signal to produce antibodies called memory B cells. And the effectiveness of these cells remains in the case of some diseases for life, and for other diseases their effectiveness decreases or disappears, so the immune system needs a stimulus in the form of a booster vaccine.
To determine whether the immune system maintains enough B cells in the event of a second “Covid-19” infection after a few months, the researchers injected radioactive parts of the SARS-CoV-2 virus into the patients’ blood samples.
In addition to detecting the immune response to the virus, the test identified the types of B cells that interact with parts of the virus.
The final results showed that after eight months of infection with the emerging coronavirus, a strong immune response is formed in the blood of a person recovering from the disease, and based on that, the researchers concluded that it is necessary to provide vaccines. with an immune response of at least eight months.
Immunologist Mino van Zelm, head of the research team at Monash University, noted that these results give us hope that the vaccines will provide long-term immunity.
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