contagion
用法要点
介词搭配
contagion常与介词of连用，表示传染源或蔓延的内容；也可与through搭配，强调传播途径。
语域说明
contagion在医学和公共卫生领域指具体的传染病传播，在社会学或心理学中则多用于比喻负面影响的扩散。
句型结构
常用作不可数名词，表示抽象概念；也可作可数名词指具体传染病例。常与动词spread、prevent、contain等搭配。
基础例句
The flu contagion spread quickly through the school, so many students stayed home.
流感在学校里迅速蔓延，因此很多学生都待在家里。
We need to wash hands often to prevent the contagion of germs.
我们需要经常洗手，以防止细菌的传染。
Her laughter had a contagion that made everyone in the room smile.
她的笑声很有感染力，让房间里的每个人都露出了笑容。
The news caused a contagion of panic among the investors.
这个消息在投资者中引发了恐慌的蔓延。
高级例句
The study examined the social contagion of obesity through social networks.
这项研究通过社交网络探讨了肥胖的社会传染现象。
Financial regulators implemented measures to contain the contagion effect from the banking crisis.
金融监管机构采取措施遏制银行业危机带来的传染效应。
In epidemiology, contagion refers to the transmission of infectious diseases via direct or indirect contact.
在流行病学中，contagion指通过直接或间接接触传播的传染病。
The contagion of misinformation on social media poses a significant challenge to public health efforts.
社交媒体上错误信息的蔓延对公共卫生工作构成了重大挑战。
高频搭配
verb
adjective
noun
adverb
preposition
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常见错误
错误在于将contagion直接作为可避免的物体。正确用法应说明避免的是接触或暴露于传染源，因为contagion通常指抽象传播过程或影响。
错误在于将contagion用作可数名词指具体疾病。在医学语境中，更常用infection或disease表示具体病症，contagion多强调传播机制或抽象概念。
近义词辨析
infection
infection强调病原体侵入生物体并引起疾病的过程，常指具体病症；而contagion更侧重于疾病或影响通过接触传播的特性，可用于比喻。
The infection caused a high fever, while the contagion led to widespread outbreaks in the community.
spread
spread是动词或名词，泛指任何事物的扩散，范围更广；contagion特指通过接触传播，常带有负面含义，如疾病或不良影响的蔓延。
The spread of the rumor was rapid, but the contagion of fear it caused was even more damaging.