Methods Samples of hair, tracheal accretion, nose swabs and anal swabs were collected and detected by isolation and culture, biochemical and microscopical examinations.

• 方法采集毛发、鼻拭子、气管分泌物、肛拭子和粪便等标本，采用分离培养、形态观察、生化反应等方法，检测不同部位细菌携带状况。