军团菌为需氧革兰染色阴性杆菌，是一种人类单核细胞和巨噬细胞的兼性细胞内寄生菌，培养和分离困难。
B-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O O O O O O B-bod I-bod I-bod I-bod O B-bod I-bod I-bod I-bod O O O O O O O O O O O O O O O O O O