How many different strains of the Ebolavirus are there?There are six species of ebolavirus, four of which are known to cause disease in humans.Is there a difference in transmissibility between the Sudan ebolavirus and the Zaire species?At this time there are not data to indicate differences in transmissibility between Sudan and Zaire ebolaviruses. However, there is ongoing research in this area. For the time being, we suggest assuming similar transmissibility.Is Ebola transmissible to family pets?There have been no reports of dogs or cats becoming sick with Ebola virus or of being able to spread Ebola to people or other animals. However, it is important to keep people and animals away from blood or body fluids of a person with symptoms of Ebola infection.