COVID-19(4) Result(3) coronavirus disease(3) healthcare(2) immune response(2) imuni odgovor(2) Receptor binding domain(2) dose(2) IgG(2) subject(2) Beckman Coulter(2) COVID-19 patient(2) median(2) neutralizing antibody(2) vaccination(2) patients(2) antitela(2) vaccine dose(2) receiving(2) mRNA(2) DiaSorin(2) SARSCoV-2(2) anti-SARS-CoV-2(2) COVID-19 vaccination(2) antibodies(2) administration(2) Patient(2) association(2) antibody(2) Pfizer(2)