染上疾病

例句：

1. 1. The doctor advised him to get vaccinated against the flu.
   医生建议他接种流感疫苗。
2. 2. The bacteria can easily spread from person to person through coughing and sneezing.
   这种细菌可以通过咳嗽和打喷嚏很容易地从一个人传播到另一个人。
3. 3. The virus is known to cause serious illnesses like pneumonia and encephalitis.
   这种病毒已知会导致严重的疾病，如肺炎和脑炎。