COVID-19(29) SARS-CoV-2(15) Patient(13) SARS-COV-2 infection(11) treated(10) addition(9) Treatment(9) therapy(8) Infection(8) spike(8) elevated(8) IgG(7) Vaccine(6) pathogenic(6) Mortality(6) patients(6) Pneumonia(5) demonstrated(5) immune response(5) disease(5) Efficacy(5) domain(5) syndrome(5) mutant strain(4) mRNA BNT162b2.(4) incidence of COVID-19(4) claimed(4) RTX(4) acute respiratory syndrome coronavirus(4) SARS CoV-2(4)