The question we need to ask here is that how did they got the virus?
It's just the same as contracting it through fluids I guess. Remember the early theory about where the virus came from? In China, when the virus mutated and came from sort of animal.
I am not sure if that's the actual origin of the virus but that's sort of it is.
Cat should not be catching the virus cause there immune system is different from ours and saying they got the virus is deluding to me. Maybe the CDC and the WHO can explain to us how come this was possible.
If you think the virus was gotten from animals, then I think we may be wrong cause the animals that host the virus supposed not to have any sign of defect.