病原菌 Traditional form: 病原菌 Pinyin (reading): bìngyuánjūn Definitions: a pathogen a bacterial pathogen Characters: 病 - sickness, illness, disease 原 - source, origin, beginning 菌 - mushroom; bacteria, germ, microbe Traditional characters: 病 - sickness, illness, disease 原 - source, origin, beginning 菌 - mushroom; bacteria, germ, microbe