2. New Italian results on monoclonal antibodies. And “Being previously infected with coronaviruses that cause the “common cold” may decrease the severity of severe acute respiratory syndrome coronavirus (SARS-CoV-2) infections…”
3. “A substantial proportion of individuals in this population showed antibody reactivity against SARS-CoV-2 antigens despite low serological evidence of SARS-CoV-2 exposure.” Nonetheless a giant puzzle!