Rise of natural acquired immunity Get additional scientific background from John’s free text books, http://159.69.48.3/ (you will need to cut and paste this link into your browser) Risk of BA.5 Infection among Persons Exposed to Previous SARS-CoV-2 Variants https://www.nejm.org/doi/full/10.1056/NEJMc2209479?query=TOC&cid=NEJM%20eToc,%20September%201,%202022%20DM1402792_NEJM_Non_Subscriber&bid=1141953912 https://www.nejm.org/doi/suppl/10.1056/NEJMc2209479/suppl_file/nejmc2209479_appendix.pdf…