感染的的英文：
contagious ;infectious

参考例句：

The contagion of mirth
笑的感染

Sows are suffering from virus pneumonia.
母猪感染病毒性肺炎。

Focal infection
病灶性感染

He had an infection in the upper respiratory tract.
他上呼吸道感染。

A cold is an infection of the upper respiratory tract.
感冒是上呼吸道的感染。

A poisoned finger
因感染而发炎的手指

focal infection
【医】病灶性感染

Localized the infection.
使感染限于局部

A slight infection.
有点轻微的感染。

semantic contagion
语义扩散[感染]

contagious是什么意思：
adj. 接触传染的；感染性的；会蔓延的

Fear can be contagious.
恐惧会感染他人。

Nothing is so contagious as enthusiasm.
热情是最富有感染力的。

The optimism of those Saturday afternoons was contagious
那些星期六下午出现的乐观精神具有感染性。

Love, happiness and tranquility are all contagious.
爱、幸福与宁静都是有感染力的。

Measles：(or rubeola)：Highly contagious viral childhood disease.
痲疹:由滤过性毒菌引起的、高度传染的小儿疾病。