The new study set out to investigate why some people don’t get Covid-19, despite being in contact with the virus

If the virus still does enter the body, the white blood cells, known as T-cells, will attack.

Researchers said the discovery, published in the Nature journal, could lead to the creation of a vaccine for all coronaviruses

Measuring T-cell response could be a more reliable indication of how coronavirus is spreading in the community than antibody testing, scientists have said.