Yeah, mutation is what is undermining herd immunity as we are seeing reinfections of those who previously had COViD and breakthrough infections among the fully immunized. On the flip side, that doesn’t diminish the value that immunization apparently still provides for protecting against severe disease and potentially future mutations.
Cant find any actual confirmed cases/documented studies of someone who has caught covid twice on the CDC web site. What testing measures did they use and how effective are these testing procedures?