Viruses don't cross species boundary.

So human viruses don't infect cats and dogs :)

There is no species boundary for bacteria infection, and antibiotics work the same for everyone.

所有跟帖： 

• 那禽流感和豬流感是咋回事？ -AtlasShrug- ♀ (0 bytes) () 09/26/2014 postreply 13:18:17

• Those are due to mutations in avian and swine flu viruses. -ZoyaWashington- ♀ (27 bytes) () 09/26/2014 postreply 18:55:31