Dr Hilary Jones has issued a warning over the public's reliance on herd immunity amid the coronavirus pandemic.The medical specialist was addressing new concerns about a Covid-19 vaccine, and whether such a remedy will be ready by Christmas as it has previously been hoped.Dr Hilary's comments come after the publication of a new report which states immunity may last for just a few months.It could mean that even with a vaccine, people could still have to have repeated injectionsThe doctor urged