At the end of August, a study was published showing that natural immunity provides much better protection against infection than the Pfizer vaccine. It was described by UCL’s Francois Balloux as “a bit of a bombshell”.
Subsequent studies have compared natural and vaccine-induced immunity at the cellular level. One found that infection-induced antibodies “exhibited superior stability and cross-variant neutralisation breadth” than vaccine-induced antibodies, suggesting that people who’d already been infected had better immunity against the then-novel Delta variant.
However, as I noted in my write-up of the “bombshell” study, its findings still needed to be replicated.
After all, certain datasets or methods of analysis can sometimes yield quirky results, which don’t survive independent empirical tests.