LONDON, Jan 10 (Reuters) - High levels of T-cells from common cold coronaviruses can provide
protection against COVID-19, an Imperial College London study published on Monday has found, which could
inform approaches for second-generation vaccines.
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The study, which began in September 2020, looked at levels of cross-reactive T-cells generated by previous common colds in 52 household contacts of positive COVID-19 cases shortly after exposure, to see if they went on to develop infection.
It found that the 26 who did not develop infection had significantly higher levels of those T-cells than people who did get infected. Imperial did not say how long protection from the T-cells would last.
"We found that high levels of pre-existing T cells, created by the body when infected with other human coronaviruses like the common cold, can protect against COVID-19 infection," study author Dr Rhia Kundu said.