Fragments that were 67% similar really doesn't sound very similar when we're talking about DNA, considering us slower evolving mammals share a larger percentage

Fragments that were 67% similar really doesn't sound very similar when we're talking about DNA, considering us slower evolving mammals share a larger percentage of DNA with our pets, and by your own stat 43% of people's T-cells are not primed to respond at all... We do designate strains of influenza transmitted from animals (and indeed other coronaviruses transmitted from animals) as novel threats.