contagion

noun

the communication of an attitude or emotional state among a number of people
多くの人々の間で態度や情緒の交換
- a contagion of mirth
  笑いの伝染
- the infection of his enthusiasm for poetry
  彼の詩への熱意が伝染すること
an incident in which an infectious disease is transmitted
伝染病が移る事件
any disease easily transmitted by contact
接触することによって容易に感染する病気の総称

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