https://www.news-medical.net/news/20221214/Study-indicates-need-for-developing-mucosal-vaccines-to-induce-potent-immune-responses-at-sites-where-SARS-CoV-2-infection-occurs.aspx
Researchers measured the antibodies against SARS-CoV-2 from nasal fluid, saliva, and plasma to compare the antibody levels between blood and mucosal fluids.
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