Mark davis, Brazilian singer-songwriter

New York, July 2 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.Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

Home

City

Latest News

Cricket

LT Premium

National

International

Maharashtra

Opinions

Chhatrapati Sambhajinagar

Nagpur

Entertainment

Photos

Business

Technology

Sports

Lifestyle

Social Viral

Lokmat Games

Health

Narendra Modi

Lok Sabha Election 2024

Heatwave In India

Mumbai Water Cut

Maharashtra Lok Sabha Election

IPL 2024

Mark DavisFOLLOW

Mark davis, Latest News

Business :Norway's Climate Investment Fund to invest Rs 500 cr in green energy firm SAEL

The Norwegian Climate Investment Fund managed by Norfund has said it will invest about Rs 500 crore in shares ... ...

Health :Explained: Why are some people more resilient to Covid-19?

New York, July 2 Many people experienced serious Covid-19 infection leading to hospitalisation and even death, while some ... ...