It’s technically novel but highly structurally and functionally similar to SARS-1. Someone who got SARS-1 17 years ago has t cells that react to SARS-2 today.
Similarly, but less strongly, exposure to other human CoVs produces t cell cross reactivity.
The “suppression/eradication” is just dogma. BTW eradicating SARS-2 is impossible. It’s zoonotic in origin. Viruses with abundant animal reservoirs can never be feasibly eradicated. Please do some reading on this it’s basic stuff.
Similarly, but less strongly, exposure to other human CoVs produces t cell cross reactivity.
The “suppression/eradication” is just dogma. BTW eradicating SARS-2 is impossible. It’s zoonotic in origin. Viruses with abundant animal reservoirs can never be feasibly eradicated. Please do some reading on this it’s basic stuff.