1 is an illness caused by an infectious agent that is transmitted directly or indirectly to a well person through a vector or an inanimate object. 2 is an individual who harbors the organism and is capable of transmitting it to a susceptible host without showing manifestations of the disease. 3 is a term given to a disease that is easily transmitted from one person to another through direct or indirect means. 4 is a person, animal or a plant on which parasite depends for its survival 5 is transmitted not only by ordinary contact but requires direct inoculation of the organism through a break on the skin or mucous membrane.