[ApesForEvolution]

So, was this an "evolutionary" process or did horses always pass immunity on in this manner?

[elbucko]

So, was this an "evolutionary" process or did horses always pass immunity on in this manner?

I don't know because the equines that never developed this ability to evolve adaptability to local infectious agents did not survive when they were exposed to new infectious agents, bacteria or virus. When they died the scavengers ate the carcass.

The argument many creationists advance is the rhetorical question of where are the "extinct" inferior species. That's just it. they're gone.