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An infectious disease or communicable disease is caused by a biological agent such as by a virus, bacterium or parasite. The vector does not have to be biological.Many infectious diseases are transmitted by droplets which enter the airway (e.g. common cold and tuberculosis).nfectious disease requires an agent and a mode of transmission (or vector). A good example is malaria, which is caused by Plasmodial parasites, chiefly Plasmodium falciparum but does not affect humans unless the vector, the Anopheles mosquito, is around to introduce the parasite into the human bloodstream.
An infectious disease is any disease caused by a pathogen (germ) such as a virus, bacteria, parasite, or fungus. Although we will mostly discuss infectious diseases in people on this page, other living organisms such as animals, plants, and microorganisms can all be made ill by an infectious disease.Pathogens.athogen is the scientific name for germ.. Infectious diseases are caused by pathogens. When your mom says to wash your hands because of germs, she wants you to get all the pathogens off your hands so they won't go into your mouth and body.