患儿男，6个月，人工喂养，腹泻2天，做粪便培养，有可疑致病菌生长时，要在最短时间内初步判断菌种，首选的方法是-查字典考试网

患儿男，6个月，人工喂养，腹泻2天，做粪便培养，有可疑致病菌生长时，要在最短时间内初步判断菌种，首选的方法是

A、不染色暗视野下观察活菌形态
B、革兰染色镜检
C、鲨实验
D、接种SS培养基
E、PCR检测

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