These diseases are transmitted from an infected person to a susceptible host through human to human contact, close association, or the exchange of bodily fluids. Examples of transmission include shaking hands, coughing, and sneezing.
A person comes into contact with the saliva, blood, urine, mucous, feces, or other body fluids of an infected animal. Examples include petting or touching animals, and bites or scratches.
These diseases are transmitted when a vector an infected person to a susceptible host. Examples include many widespread diseases caused by microbes that are transmitted via insect vectors, mainly mosquitoes.
Coming into contact with areas where animals live and roam, or objects or surfaces that have been contaminated with germs. Examples include aquarium tank water, pet habitats, chicken coops, plants, and soil, as well as pet food and water dishes.