Even when exposed to the SARS-CoV-2 virus intranasally, people with faster or more subtle immune responses didn’t become infected.
https://www.theepochtimes.com/health/first-of-its-kind-study-explains-why-some-people-dont-get-covid-19-post-5671526?utm_source=ref_share&utm_campaign=copy
A plain-language guide to what the research now shows
https://www.malone.news/p/what-your-covid-booster-did-to-your