T-cell Covid immunity 'present in adults six months after first infection'

Study suggests white blood cell levels higher in people who had symptoms

• Coronavirus - latest updates
• See all our coronavirus coverage

Cellular (T-cell) immunity against the virus that causes Covid-19 is likely to be present within most adults six months after primary infection, with levels considerably higher in patients with symptoms, a study suggests.

The data offers another piece of the puzzle that could be key to understanding whether previous Sars-CoV-2 infections - the virus behind Covid-19 - can prevent reinfection, and if so, for how long.