Previous Covid-19 infection provides some immunity for at least five months, but people may still carry and transmit the virus, according to a new study. Professor Susan Hopkins, senior medical adviser at Public Health England and lead of the Siren study said the "vast majority" of participants were protected from re-infection and described the findings as "very good news". Report by Blairm. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn