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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 an illness that can be transmitted from person to person. There are several different causes of infectious diseases, including parasites, fungi, bacteria and viruses. Infections can develop in all areas of the body including the heart, brain, lungs and bones.ome infectious diseases, such as the common cold, are easily identified and treated; however, an infectious disease can also be complex and difficult to diagnose and treat. An infectious disease physician is a doctor who is an expert in diagnosing, treating and preventing various types of infectious diseases.