Another obvious characteristic of this virus’ infectivity which says it still has strong ties to animal disease is its ability to readily infect minks from humans with probable back infection of humans. Its relative ease of infection of cats and also, but less so, dogs from humans with less probability of back infection to humans is more evidence that the virus still maintains animal infective potential. The disease is not just a zoonosis, it is also a anthroponosis , an infectious disease of humans that can be transmitted naturally to other animals. Another example is tuberculosis (bacterial) transmitted from humans to captive primates and elephants.