When a virus jumps between animals and humans, it’s called “cross- species host switching”. It’s believed that SARS, hantaviruses, Ebola and Marburg viruses, Nipah virus, Hendra virus, and human immunodeficiency virus type 1 (HIV-1) and HIV-2 all began as enzootic viruses (viruses that affect animals) that cross-species host switched to infect humans.
And… animals can also be infected with human viruses. In fact, ferrets are susceptible to many strains of influenza (the flu) virus, and develop symptoms similar to those in humans, so laboratories studying the flu often use ferrets as a model. The guinea pig has also been described as an alternative animal model for studying influenza virus transmission.
In theory, yes. But humans are not meant to mate with animals.
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