Cytotoxic T lymphocytes kill virus infected cells and work in prevention of viral infection.
The killer lymphocytes also perform such jobs.
A section of such T cells act as memory cells and can act in prevention of reinfection.
What is their role in prevention of mutated Covid -19 reinfection?
How long such memory T cells of recovered patients can protect a person?
T-cells are part of the cellular immunity system that recognizes and attacks certain invading pathogens. Once the pathogen has been defeated most T-cells triggered by the pathogen slowly recede but a certain number remain - the so-called "memory cells" that, if challenged again by the same pathogen replicate in great numbers to abrogate the attack. On the other hand, humoral immunity (antibodies) also play a defensive role against pathogens. Both are active against the Covid-19 virus and can be tested as an indication of prior infection.
THEORETICALLY THEY ARE EFFECTIVE. HOWEVER, SUCH CLINICAL EVIDENCE REMAINS TO BE INTENSIFIED.
Please see the link below.
https://www.news-medical.net/health/Role-of-T-Cells-in-COVID-19.aspx
Dear Dr. Arvind Singh,
From the article, it was available that....a vast majority of COVID-19 patients develop an immune response against SARS-CoV-2 with the activation of T-cells to the spike-protein of the virus. By recognizing the spike-protein specifically the receptor-binding domain – which is the most effective site for neutralizing antibodies – a robust immune response can be mounted and may remain protective for future infections.
In a minority of patients that develop more severe disease, reduced T-cell count with an ‘exhaustive’ phenotype may be associated with a ‘cytokine storm’, impacting recovery.
Source: https://www.news-medical.net/health/Role-of-T-Cells-in-COVID-19.aspx.
BUT,
How long that protection power of the body against the Covid - 19 will last among the already suffered persons? The answer to this question is not clear...
Thanks.
A lot of different types of immune cells are present in human bodies. It needs to know which types of immune cells are more effective and how they act to COVID19