This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An agent that causes disease, especially a living microorganism such as a bacterium or fungus.

n. Any organism or substance, especially a microorganism, capable of causing disease, such as bacteria, viruses, protozoa or fungi. Microorganisms are not considered to be pathogenic until they have reached a population size that is large enough to cause disease.

n. Any microorganism which causes disease; a pathogenic organism; an infectious microorganism; a bacterium, virus, or other agent which can cause disease by infection; -- opposed to zymogene. The spelling pathogene is now archaic.

n. any disease-producing agent (especially a virus or bacterium or other microorganism)

"More people than just me immediately thought of Michael Crichton’s The Andromeda Strain, in which a deadly pathogen is brought to Earth from space."

pathogene   

zymogene   

microorganism    infectious agent    infective agent   

pathogenous    pathogeny    pathogenesis    pathogenic   

earwax    mastorm    liscom    extacy    point-down    tarantass    post-array