Comment by rgbbtc4life

Natural antibodies target several proteins: https://directorsblog.nih.gov/2021/05/18/human-antibodies-ta...

Natural immunity robust and long lasting: https://www.nytimes.com/2020/11/17/health/coronavirus-immuni...

Killer t cell importance: https://www.nature.com/articles/d41586-021-00367-7