Covid-19 immunity 'may last longer than previously thought'

Thirumala-Devi Kanneganti vice chair of St. Jude Immunology, Bhesh Raj Sharma  and Rajendra Karki  in Kanneganti's lab.- ST. JUDE CHILDREN'S RESEARCH HOSPITAL

Of the 11,052 employees without Covid-19 antibodies, 89 developed an infection with symptoms during the 30-week period.

In the first trial to judge whether antibodies actually prevent people from getting the virus for a second time, researchers tracked 12,180 healthcare workers, of whom roughly 10 per cent had caught coronavirus. How long will immunity last in COVID-19 patients?

The study, led by scientists at La Jolla Institute for Immunology at San Diego university in the U.S., assessed elements of the immune response including antibodies and T-cells, and found the "immune memory" may last for at least eight months.

"However, the neutralizing activity of antibodies to SARS-CoV-2 has primarily been tested using cells cultured in the laboratory, and how these in vitro results translate to protection in animals or humans has not been determined".

Coronavirus is absolutely a new infection in people and people don't have immunity to the virus when the pandemic started. Various previous studies have shown that immunity against covid-19 can last for around six months.

They found that eight months after infection, most people who recovered still had enough immune cells to fight off the virus and prevent illness.

People who had COVID-19 are protected against reinfection with the virus for at least six months, according to a study posted online Friday by researchers at Oxford University in England.

Thirumala-Devi Kanneganti vice chair of St. Jude Immunology.- ST. JUDE CHILDREN'S RESEARCH HOSPITAL

In other words, there was a very slow rate of decline of these cells, demonstrating that they persist in the body for a very long time.

While the study has not yet been peer-reviewed, and the researchers said they need to do more studies to see if the immunity lasts more than six months, the preliminary results are promising news as scientists continue to develop vaccines for the virus.

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She worked with Bhesh Raj Sharma, Rajendra Karki and others at her lab for the research that helps increase understanding of the pathways and mechanism that drives Covid-19 inflammation so researchers can develop effective treatment strategies.

As record-breaking numbers of COVID-19 infections continue to surge across the US, scientists at St. Jude Children's Research Hospital say they've found a possible COVID-19 treatment, and suggest that the "process driving life-threatening inflammation, lung damage and organ failure in patients with COVID-19, sepsis and other inflammatory disorders" could possibly be treated using existing drugs. Covid-19: Two of the vaccine front runners have already reported promising evidence - so what now?

The phrase cytokine storm has been used to describe the dramatically elevated cytokine levels in the blood and other immune changes that have also been observed in COVID-19, sepsis and inflammatory disorders such as hemophagocytic lymphohistiocytosis (HLH), St Jude's said in a statement.



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