matthew barton, professor of physical medicine and rehabilitation. thank you for his thoughts. thank you. and from the feeling that cobra had never left its now onto the worry of catching it again. here is one of your questions for our science correspondent there. williams. paul, i had coven 19 recently, and recovered vin not long ago, found out i was exposed again. could i have been infected again? the data we have indicates that although it's not impossible it's, it's highly unlikely. a lot of researchers have looked at this question and come to that conclusion. for instance, a recent large scale study involving over 25000 healthcare workers in britain showed that having had over 900 ones, had a dramatic protective effect for at least 7 months after an infection. the strength of the effect was close to the one observed and people who had 2 doses of our most effective vaccines. additionally, this study showed that people who had covered 19 then tested positive again for it a few months or weeks after convalescence. the chances of developing symptoms were also much lower than a