A majority of uninfected adults show preexisting antibody reactivity against SARS-CoV-2
"more than 90% of uninfected adults showed antibody reactivity against the spike protein, receptor-binding domain (RBD), N-terminal domain (NTD), or the nucleocapsid (N) protein from SARS-CoV-2. "
Hum, more than 90% were already immune due to previous exposure to colds!
https://pubmed.ncbi.nlm.nih.gov/33720905/