i is a senior clinical lecturer at the university of exit us medical school. he says that unless poorer nations, a fully vaccinated, richer countries immunizing that population multiple times won't stop variance emerging. every little controlled exposure to the wireless is proteins enables your body bodies immune system to be reminded and then reminded again that you need to make immunity against me. and more importantly, that remember me in other words, immune memory. so of course, it makes a lot of biological sense that a 4th and maybe a 5th vaccine out would be beneficial in that it augment the immunity. having said all this, that is of cause a concern that we need to also immunize the rest of the world to we need to immunize people who have not had any vaccines at all. because that is where the greatest public health gain comes from. again, this is an example of the rich a nation's can do whatever they like, because they've got the vaccines that what the supplies and they can immunize their population once twice christ. and now the 4th time, the credit is