"Sarbecovirus" . "Immunology" . "Syndromes affecting the respiratory system" . "Bird diseases" . "Bat virome" . "Atypical pneumonias" . "Zoonotic bacterial diseases" . "Severe acute respiratory syndrome" . "Two-Year Prospective Study of the Humoral Immune Response of Patients with Severe Acute Respiratory Syndrome" . "Cohort study methods" . . "Viral respiratory tract infections" .