Deborah Dunn-Walters, professor of immunology at the University of Surrey, is just as unequivocal about how people should behave due to a couple of reasons she says. 

• One is, you're not going to be fully protected.
• There is no evidence as yet that having had the vaccine will stop you from getting the virus and passing it on.

Dunn-Walters explains that the efficacy of the vaccines were largely assessed by looking at whether they prevented people from developing symptoms and not if they stopped them from being infected with the virus. And we do know that it's possible to have an asymptomatic infection. There is not yet any evidence that one dose – or even two – of the existing vaccines will stop people from giving the virus to others.