a.

1. 接觸傳染性的
   Chicken pox is a contagious disease.

   水痘是一種透過接觸而傳染的疾病。

2. （可能）帶接觸傳染原的
3. 照料接觸傳染病人的
4. （感情等）感染性的；會蔓延的
   Fear can be contagious.

   恐懼會感染他人。

adj.

1. (of a disease) spread by direct or indirect contact of people or organisms.
   ▸having a contagious disease.
2. (of an emotion, attitude, etc.) likely to spread to and affect others:
   her enthusiasm is contagious.