Lead author author Dr. Muge Cevik of the University of St. Andrews, U.K. said in a statement that the new analysis "provides a clear explanation for why SARS-CoV-2 spreads more efficiently than SARS-CoV and MERS-CoV and is so much more hard to contain".
"Several studies have found that individuals with asymptomatic infection may clear the virus faster, suggesting that those without symptoms may be as infectious as those with symptoms at the beginning of infection, but may be infectious for a shorter period".
They found that eight months after infection, most people who recovered still had enough immune cells to fight off the virus and prevent illness.
It is known as the innate immune response and includes the release of chemicals that cause inflammation and white blood cells that can destroy infected cells.More news: Facebook and Google extend working from home to end of year
A study published Friday by Oxford University ensures that people infected with coronavirus have little chance of returning to the disease in at least six months.
"The paper confirms the importance of looking at memory B cells and memory T cells in order to assess immunity and shows the best types of memory cells to look for and the best time to look for them".
T cells are considered fundamental to define the durability of the immune response after a coronavirus diagnosis as, "T cell memory might reach a more stable plateau, or slower decay phase, later than the first six months post-infection", the study reads.
Scientists have been scurrying to understand immunity against reinfection with SARS-CoV-2 (the virus that can lead to Covid-19). "Firstly, although most of the cases described here had mild disease, it looks as though their immunity to a second infection is reasonably high".More news: Amazon's Making An Upgraded Version Of Its Echo Frames Available To Everyone
Someone's behavior, or lack thereof, such as poor hygiene and careers such as those in health care could also contribute to superspreading events because of increased contact with many different people. "This means that the population level of immunity may be rising which will eventually lead to reduced transmission", Evan said adding that this, coupled with immunity being conferred by vaccination, offers prospects of transmission of the virus being markedly reduced over the next year or so. "We do not know that for certain yet, but it is encouraging", said Evans.
About the study: The study included 185 adults, ages 19 to 81, in the United States who had recovered from Covid-19.
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.
According to a study by frontline health workers fighting the UK's coronavirus epidemic, people who have Covid-19 are more likely to be re-contracted at least six months after their first infection.More news: Trump addresses virtual G-20 summit, heads out before session on pandemic