Infection(29) COVID-19(25) SARS-CoV-2(23) disease(17) mucosal(14) Local(13) effective(12) subsequent(12) reduce(11) Pneumonia(11) COVID-19 vaccine(11) Transmission(11) SARS-COV-2 infection(11) Kinetics(11) mucosal IgA response(11) IgA(11) Cell(10) infect(10) Human(9) modulation(9) demonstrated(9) Evidence(9) infections(8) intestinal epithelial cells(8) epithelial cells(8) clinical trial(8) SARS-CoV-2 infected individuals(8) animal model(8) hyperinflammation(8) characterized(8)