Research indicates lasting immunity after recovering from COVID 19

A research indicated that there is a long-lasting memory of infection in the immune system of recently-recovered COVID-19 patients. Find out more details about this long-lasting immunity below.
Research indicates lasting immunity after recovering from COVID 19 Research indicates lasting immunity after recovering from COVID 19
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A recently conducted research funded in part by NIH’s National Institute of Allergy and Infectious Diseases (NIAID) and National Cancer Institute (NCI), found that the immune system retains a memory of the infection after people recover from COVID-19. Immune cells and proteins that circulate in the body can recognise and kill the pathogen if it is encountered again, protecting against disease and reducing illness severity.


The immune protection involves components like antibodies that are the proteins that circulate in the blood and recognise viruses and neutralise them and different types of T cells help recognise and kill pathogens. B cells make new antibodies when the body needs them.

These components have been found in recently-recovered COVID-19 patients. But the details of this immune response and how long it lasts after infection have been unclear. 

The researchers found durable immune responses in the majority of people studied. Antibodies against the spike protein of SARS-CoV-2, which the virus uses to get inside cells, were found in 98 percent of participants one month after symptom onset. 

In the research, it was observed that the virus-specific B cells increased over time in recently-recovered COVID-19 patients. They had more memory B cells six months after symptom onset than one month afterwards. 



The level of T cells that recognise and kill pathogens also remained high after infection. Six months after symptom onset, it was observed that 92 percent of participants had CD4+ T cells that recognised the virus. About half the participants had CD8+ T cells, which kill cells that are infected by the virus.


With regard to antibodies, the numbers of different immune cell types varied substantially between individuals. Any disease severity levels of gender differences could not be accounted for this variability. 


Also Read: Know when should a recently recovered COVID 19 patient get vaccinated