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Stuffy nose, full set of teeth could make people Covid-19 superspreaders

Coronavirus immunity in some people may last more than six months, early research suggests Infectiousness peaks in first five days of COVID-19 symptoms, research suggests
Sandy Nunez | 22 November, 2020, 12:53

The release said researchers know that when a person is infected with COVID-19, blood levels of multiple cytokines increase.

To date, studies have found that antibodies against the new coronavirus offer varying levels of immunity from infection.

The more antibodies people had, the lower their chances of re-infection.

The researchers then followed whether staff who had been infected before had the same number of new Covid-19 infections as those who had not been infected before.

They indicated that having the virus once "provides at least short-term protection" from getting it again, she said.

The Oxford study enrolled more than 12,000 healthcare workers of which 11,000 tested negative for Covid-19 antibodies. This also means that repeated vaccinations will not be necessary and that the human body will produce enough immune cells to protect it from the deadly virus.

A Portuguese study found that in the more than the 300 coronavirus patients examined, the antibody response was the strongest in the first three weeks after symptoms.

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. "We did not find any new symptomatic infection in any of the participants who tested positive for antibodies".

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But none of the three became unwell.

But newer recent research on T-cells was more optimistic, suggesting a response could last for much longer. "It gives us hope that immunity to SARS-CoV-2 could last for several years", said Prof Deborah Dunn-Walters, Professor of Immunology at University of Surrey and Chair of the British Society for Immunology expert advisory group on covid-19 Immunology.

Earlier in the week, a study conducted by Public Health England looked at T-cells - another element of our immune systems' response to infection.

"Such features may be underlying factors driving super spreading events in the COVID-19 pandemic", he added.

The paper concluded this immunity was likely to be there "because of previous infection with coronaviruses other than SARS-CoV-2", for example the common cold virus.

"T cell memory might reach a more stable plateau, or slower decay phase, later than the first 6 months post-infection", the study states.

But Dr Rupert Beale at the Francis Crick Institute pointed out that this equated to "only a very small proportion of adults (less than 10%, maybe much less than 10%)" who would be protected by pre-existing T cell immunity. Later, it was observed that most of these individuals had the immune cells to fight against the virus and prevent reinfection.