saliva borne disease

例句：

1. 1. The child was diagnosed with a contagious disease.
   这个孩子被诊断出患有传染病。
2. 2. He contracted an infectious disease while traveling abroad.
   他在出国旅行时感染了一种传染病。
3. 3. The doctor advised the patient to take preventive measures against infectious diseases.
   医生建议病人采取预防措施，避免传染病。