2 reasons. The 1st was already covered by someone else, namely that you do not want the infection to become a pandemic that wipes out a large portion of a livestock species.
The 2nd is that disease is very often due jump from livestock to humans. Some of the recent callings have involved things like avian flu that has already done so in the past. But even with other pathogens you won’t be careful, especially if they are airborne.
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