I don't know. From what I've seen there are a handful of studies released over the last 5 months showing that natural immunity is as good or better than the vaccines. I believe the study in Israel included the Delta variant. And keep in mind the original vaccines were made prior to the variants. With that said the boosters may change things. But I for one haven't seen any studies showing large numbers of people who had covid previously getting it a second time. And I especially haven't heard of someone having a severe case when contracting the virus a second time. I'm not saying it doesn't happen but that data would better support the argument for the vaccines and boosters for those who have already had confirmed cases.