病原性 pathogenicity：病原体感染给寄主引起疾病的能力称为病原性。
目的：研究下呼吸道感染患者病原性细菌的分类及耐药性。
Objective: To analyze patients with lower respiratory tract infections classification of pathogenic bacteria and drug resistance.
方法：采用K-B纸片扩散法，对病原性大肠杆菌进行药敏实验。
Methods: Adopt the K-B slip method, carry on the medicine quick experiment to the cause E. coli.
隐孢子虫和贾第鞭毛虫是两种严重危害水质安全的病原性原生动物。
Cryptosporidium and Giardia axe two common species of pathogenic protozoan, seriously endangering the water quality.
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