The bacteria are originally found in mice and cause mites feeding on the mice (usually the house mouse) to become infected. Humans will get<unk>  when receiving a bite from an infected mite, not from the mice themselves. The mite is Liponyssoides sanguineus, which was previously known as Allodermanyssus sanguineus.
Rickettsialpox
Rocky Mountain spotted fever
Chickenpox
Pacific Coast tick fever
Smallpox
Cowpox
Sealpox
Mumps