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Modes of Organism Transmission: Direct Transmission-person to person through touching, biting, kissing, or sexual transmission. Indirect transmission may be either vehicle-borne or vector-borne. Vehicle-borne any substance that serves as an intermediate means to transport and introduce an infectous agent into a susceptible host through a suitable portal of entry. Example food or water may become contaminated by a food handler who carries the hep A virus. The food is then ingested by a susceptible host. Vector-borne is an animal or flying or crawling insect that serves as an intermediate means of transporting the infectious agent. Another mode is airborne transmission may involve droplets or dust.
Fundamentals pg 633