RICHMOND : The increasing prevalence of new variants of the coronavirus raises more and more questions about the level of protection even after vaccination: won't these changes in the SARS-CoV-2 virus escape the immunity obtained?
The microbiologist and specialist in infectious diseases William Petri , of the University of Virginia, answers the most frequent questions about vaccines and their recall in 6 points. What is a vaccine booster? A vaccine booster is the injection of an additional dose, intended to maintain immune protection against a given pathogen.
The process is common because our immunity can weaken over time quite naturally. For example, the flu shot must be repeated every year, those against diphtheria and tetanus every