pathogenic bacteria

例句：

1. 1. Pathogenic bacteriacan cause serious illnesses in humans.
   致病菌可以引起人类严重的疾病。
2. 2. The hospitalwas contaminated with pathogenic bacteria.
   医院被致病菌污染了。
3. 3. Researchersare working to develop vaccines against pathogenic bacteria.
   研究人员正在努力开发针对致病菌的疫苗。