phenotype(9) COVID-19(8) SARS-CoV-2(7) frailty(6) expression(6) age(6) Older(6) disease(5) reduced(5) resource(5) Patient(5) Adults(4) Care(4) help(4) Cell(4) tissue(4) Host immune response(4) paracrine(4) Health(4) individual(4) syndrome(4) senescent cell(4) COVID-19 vaccine(4) human cell(3) caused(3) Inflammation(3) SARS-CoV-2-infected cell(3) mice(3) less(3) ENhance(3)