STD in animals and human have a historical bond. HIV is a sexually transmitted disease that is transmitted from chimpanzees to humans. Animals that show a common STD is brucellosis found in domestic animals but can be treated with antibodies. The bacterial STD Chlamydia is shared by humans and animals that are transmitted by the mucous membrane. IIV-6 is the most confusing virus in the animal that infects Texa crickets that tend them to have more sex than the normal crickets and makes them infertile. Testing animals for STD can improve vaccination of people for getting rid of the life-threatening STD.