If we are ever to return to some semblance of normality, then the world’s population needs to be immune to SARS-CoV-2, the virus that causes COVID-19. But with so many different vaccines in production, questions are undoubtedly going to be raised, such as can I still have a vaccine if I have been involved in trial testing other versions? And, what if I’ve already had COVID-19 – do I still need a vaccine? A basic understanding of immunology can answer all these questions. All COVID-19 vaccines try to generate an immune response to proteins the virus needs to enter your…

This story continues at The Next Web