As I was typing this, a news item jumped up on the right hand corner of the screen stating that there have been an expansion of Covid cases in India. While that seems bad, it has been reported that while Covid vaccination rates are poor, 68 percent of Indians have antibodies to Covid, so there is a case of high natural immunity developing. India could prove to be another test case.
https://www.theguardian.com/world/2021/jul/21/covid-19-antibodies-detected-in-67-of-indias-population