Horde of Bats_Getty_900x506
This horde of bats could contain possible carriers of the rabies virus, 1972. Most of the recent human rabies cases in the United States have been caused by rabies virus that was transmitted through a bat vector. However, it is rare for humans to contract rabies from infected bats. Image courtesy CDC/Arthur E, Kaye. (Photo by Smith Collection/Gado/Getty Images)