human 241 Humans 211 immunology 173 Article 151 female 114 controlled study 103 male 97 Female 89 adult 84 Male 79 metabolism 79 Animals 69 genetics 69 animal 68 nonhuman 63 COVID-19 61 SARS-CoV-2 56 middle aged 53 Middle Aged 52 mouse 52 Adult 46 major clinical study 46 procedures 45 Mice 43 pathology 41 aged 40 unclassified drug 37 human cell 36 Immunology 35 blood 34