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Pathogen was a microorganism that carried a disease.
At some point in the 2020s, Adam Lang's bloodstream had been infected with an alien pathogen. It was later identified as Praxeus. (TV: Praxeus [+]Loading...["Praxeus (TV story)"])
When the Doctor explained Christmas to him, Davros compared the holiday to a pathogen, one carried in the hearts and minds of those infected. (PROSE: Father of the Daleks [+]Loading...["Father of the Daleks (short story)"])