All diseases and/or all infections that can be transmitted naturally between animals and humans (from animal to human = zooanthroponosis and from human to animal = anthropozoonosis).
About 200 diseases are known.
A zoonosis is therefore an infectious disease that can affect both humans and animals.
Excluded are pathogens that occur in the environment and reach humans via contamination of food.
In the "direct (ortho-) zoonosis", infection occurs through direct contact or through a mechanical vector from one vertebrate to another (e.g. scabies transmission from human to human).
Epizoonoses are skin parasitoses caused by arthropods, e.g. diseases caused by lice, mites, ticks, etc.