Explained: Why Are Some People More Resilient to Covid-19?

Date:

People walk past posters of suggestions for COVID-19 prevention in New York, the United States onDec. 21, 2020. — (Xinhua/Wang Ying/IANS)

NEW YORK — Many people experienced serious Covid-19 infection leading to hospitalisation and even death, while some people escaped with milder symptoms.

The reason: They had prior run-ins with other coronaviruses — the ones that cause about a quarter of the common colds kids get, according to a study.

Researchers from the Stanford University in the US showed that in such people, the immune cells are better equipped to mobilise quickly against SARS-CoV-2, the virus responsible for Covid-19.

The immune cells, called killer T-cells, roam through the blood and lymph, park in tissues and carry out stop-and-frisk operations on resident cells.

The study, published in the journal Science Immunology, showed that killer T-cells taken from the sickest Covid-19 patients exhibit fewer signs of having had previous run-ins with common-cold-causing coronaviruses.

Many of these killer T cells were in “memory” mode, said Mark Davis, Professor of microbiology and immunology at the Stanford’s School of Medicine.

“Memory cells are by far the most active in infectious-disease defense. They’re what you want to have in order to fight off a recurring pathogen. They’re what vaccines are meant to generate,” Davis said.

For the study, the team analysed blood samples taken from healthy donors before the Covid-19 pandemic began, meaning they’d never encountered SARS-CoV-2 — although many presumably had been exposed to common-cold-causing coronavirus strains.

They found that Covid-19 patients with milder symptoms tended to have lots of killer-T memory cells directed at peptides SARS-CoV-2 shared with other coronavirus strains.

Sicker patients’ expanded killer T-cell counts were mainly among those T-cells typically targeting peptides unique to SARS-CoV-2 and, thus, probably had started from scratch in their response to the virus.

“It may be that patients with severe Covid-19 hadn’t been infected, at least not recently, by gentler coronavirus strains, so they didn’t retain effective memory killer T cells,” Davis said. — IANS

theclarionindia
theclarionindiahttps://clarionindia.net
Clarion India - News, Views and Insights about Indian Muslims, Dalits, Minorities, Women and Other Marginalised and Dispossessed Communities.

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Share post:

Subscribe

spot_imgspot_img

Popular

More like this
Related

M S Swaminathan: A Light that Shone was No Ordinary Light

NEW DELHI - M.S Swaminathan is no more. The...

Will You Resign if Nothing Found in Probe, Kejriwal Asks PM Modi over House Renovation Row

NEW DELHI- Delhi Chief Minister Arvind Kejriwal on...

Govt Crushed Hopes & Dreams of Youth, Leading to Rising Suicides among Them: Congress

NEW DELHI - Congress on Thursday again trained its...

LS Speaker Refers Complaint against BJP MP Bidhuri to Privileges Committee

NEW DELHI - Days after several Opposition MPs wrote...