pathogenic flies

例句：

1. 1. Pathogenic bacteria can cause serious illnesses.
   致病细菌可以引起严重的疾病。
2. 2. The patient was diagnosed with a contagious disease.
   病人被诊断出患有传染病。
3. 3.The doctor warned us about the risk of contracting an infectious disease.
   医生警告我们可能感染传染病的风险。