In the chain of infection, which term best describes the means by which a pathogen is transmitted between hosts?

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Transmission route refers to how a pathogen moves from one host to another. In the chain of infection, the agent is the microbe itself, the reservoir is where it lives, the portal of exit is how it leaves that reservoir, and the portal of entry is how it enters the next host. The transmission route captures the various pathways that carry the microbe between people—direct contact, droplets, airborne spread, vehicles like contaminated instruments or foods, and vectors. This is the best term because the question asks for the means by which the pathogen is transmitted between hosts, not where it resides (reservoir), how it exits (portal of exit), or the organism itself (the agent). Understanding transmission routes informs the controls you’d implement across settings, from hand hygiene and PPE for direct contact or droplets to ventilation and cleaning for airborne or vehicleborne spread.