Original Covid-19 Vaccines Not Effective For Nasopharyngeal IgA Protection Against Next Infection

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Anti-Spike Mucosal IgA Protection against SARS-CoV-2 Omicron Infection

Havervall et al, Karolinksa, Sweden, NEJM, demonstrates its really the respiratory infection and the natural IgA response to that illness that is protective among those who tripled. 

Taking it in the old obsolete vaccine in the arm is irrelevant for nasopharyngeal IgA protection against next infection.