4 ms·This is the perfect way to allow viruses to cross species and get to humans.by basicplus2 10y agoThis is the perfect way to allow viruses to cross species and get to humans.sudhirj 10y agoAlso applies to immunity.DanBC 10y agoThe perfect way is what already happens in many parts of the world - have humans and livestock in close proximity with poor controls over biosecurity.return0 10y agoDoes this facilitate it? how?