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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.
A disease is a common noun (measles, influenza, plague). The exception is diseases that take their name from a person or place (Ebola virus disease-the virus is named after a river in the Democratic Republic of Congo, Guillain-Barre syndrome, Alzheimer's disease.Don't yet have a reference.ike all words, they are capitalized when they begin a sentence. There are some diseases whose names contain a proper name (i.e. Lou Gehrig's disease). The proper name is capitalized within the disease name, but the whole disease name is not capitalized (i.e. not disease). â Ian MacDonald Mar 16 at 19:26.