Viruses happen and we can’t do much about that, but we should be concerned about knowingly sending sick animals to their intended destinations! They can get everyone sick and that can become quite costly!

Parvovirus - RV:
     Rat (and wild) is natural host.
     Can affect hamsters, mice, kittens.
     Transmission fecal-oral, urine, milk, direct contact, aerosol exposure.

Paramyxovirus - Sendai Virus (SV):
     Rat and mouse is natural host (moreso mouse).
     Can affect hamsters, guinea pigs, rabbits, marmosets(???).
     Transmission airborne, direct contact, aerosol exposure.

Paramyxovirus - Pneumonia Virus of Mice (PVM):
     Mouse is natural host (moreso mouse).
     Can affect rats, hamsters, gerbils, guinea pigs, rabbits, mongooses(???), and perhaps monkeys and humans.
     Transmission direct contact.

Reovirus - Infectious Diarrhea of Infant Rats (IDIR):
     Rat is natural host (moreso mouse).
     Can affect humans.
     Transmission oral-fecal.

Lymphocytic Choriomeningitis Virus (LCMV):
     Wild mouse is natural host.
     Can affect mice, hamsters, humans.
     Transmission fecal-oral.

Hemorrhagic Fever with Renal Syndrome (HFRS):
     Wild rat is natural host.
     Can affect humans.
     Transmission dirty bedding, saliva, respiratory.