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Re:Covid vaccine: First ‘milestone’ vaccine offers 90% prote... by coryfklein on Monday November 09, 2020 @12:01PM (#25036856)
Because it's cost prohibitive to find every animal on the earth that has the virus and medicate or eliminate them.
Re:Covid vaccine: First ‘milestone’ vaccine offers 90% prote... by dorgo on Monday November 09, 2020 @02:15PM (#25038537)
Humans already eradicated a disease (I think it was a virus). It was done with a vacine of an altered version of the virus. The vacine itself was a virus which could infect others and spread among the population.

So, you don't really have to find every animal. Most should be enough.