The really big one is bird flu which is potentially a big problem. People are worried that flu from birds will cause a major human epidemic at some point There are lots of bacteria and viruses that can move between species though.
Loads! A few examples: herpes simplex viruses, hepatitis, influenza, tularensis, query fever…the list goes on and on. Many pathogens can cross the species barrier and infect say specific groups of mammals.
Cheers,
Carmen
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