scarlet fever prophylactic

例句：

1. 1. To prevent the spread of scarlet fever, it is important to wash your hands frequently.
   为了预防猩红热的传播，经常洗手是很重要的。
2. 2. The school has implemented a new prophylactic measure against the virus.
   学校已经实施了一种新的预防措施来对抗这种病毒。
3. 3. The doctor advised him to take a prophylactic vaccine before going abroad.
   医生建议他在出国前接种疫苗作为预防措施。