COVID-19(29) SARS-CoV-2(15) Patient(13) SARS-COV-2 infection(11) treated(10) addition(9) Treatment(9) therapy(8) elevated(8) Infection(8) spike(8) IgG(7) pathogenic(6) Mortality(6) patients(6) Vaccine(6) immune response(5) Pneumonia(5) disease(5) demonstrated(5) syndrome(5) Efficacy(5) domain(5) SARS-CoV-2 lineages(4) RBD IgG(4) age(4) AD(4) phototherapy(4) country(4) Comparative(4)