a question about the corona virus feel free to get in contact with our science correspondent darrent williams. if you are a symptomatic and don't know you have called it 19 is it dangerous to be vaccinated . the short answer to this appears to be no but it's pretty complicated question so of course there's a little more to it than that current advice from the u.s. centers for disease control focuses mostly on whether or not people who've had the disease and recovered can be safely backs unaided afterwards the answer to that is a clear yes however the c.d.c. is far less clear about people who might have an active asymptomatic infection at the moment they get a shot the implication though is certainly that there's no reason to think that vaccination would pose a danger that's because the guidelines do say there's no need to test negative for infection before you're vaccinated they also say that even if you've been exposed and have been tested and are awaiting results if you live somewhere like a rest home you should go ahead and be vaccinated as long as you don't have any symptoms i'm sure the