Coronavirus: Immunity may be more widespread than tests suggest

People testing negative for coronavirus antibodies may still have some immunity, a study has suggested.

For every person testing positive for antibodies, two were found to have specific T-cells which identify and destroy infected cells.

This was seen even in people who had mild or symptomless cases of Covid-19.

But it's not yet clear whether this just protects that individual, or if it might also stop them from passing on the infection to others.

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