May 26, 2015 · Infectious diseases spread through transmission routes that vary in contact intensity along a spectrum from indirect to direct transmission, where contact might be thought to increase in importance for transmission as one moves from environmental contamination to vector-borne, and then to aerosol, to close-contact, and finally to sexually ... Zoonotic diseases are very common, both in the United States and around the world. Scientists estimate that more than 6 out of every 10 known infectious diseases in people are spread from animals, and 3 out of every 4 new or emerging infectious diseases in people are spread from animals. Many of them are harmless, and some can even be helpful. But some of them can make you sick. Infectious diseases are diseases that are caused by germs. There are many different ways that you can get an infectious disease: Through direct contact with a person who is sick. This includes kissing, touching, sneezing, coughing, and sexual contact. Contact Diseases are transmitted when an infected person has direct physical contact with an uninfected person and the microbe is transmitted from one person to another. Contact diseases may also spread through indirect contact with the environment or personal items of an infected person. Jan 17, 2011 · There are five main routes of disease transmission: aerosol, direct contact, fomite, oral and vector, Bickett-Weddle explained at the 2010 Western Veterinary Conference. Diseases can be spread to humans (zoonotic) by those same five routes.