Nasal COVID vaccine blows clinical trial, flinging researchers back to the lab - Enlarge / A man receives an H1N1 nasal flu spray vaccine at an urgent c... - https://arstechnica.com/?p=1889484 #infectiousdisease #publichealth #astrazeneca #antibodies #sars-cov-2 #infection #covid-19 #medicine #science #biology #vaccine #nasal #iga