contagion
/kənˈteɪdʒən/noun
mass noun
1- the communication of disease from one person to another by close contact（疾病的）接触传染, 触染：
the rooms held no risk of contagion.
这些房间没有接触传染的危险。
1.1
- count noun dated a disease spread in such a way〈旧〉接触传染病, 触染病。
1.2
- figurative the spreading of a harmful idea or theory〈喻〉（有害观念或理论的）传播, 散布, 蔓延：
the contagion of disgrace.
不光彩事的散播。
词源
late Middle English (denoting a contagious disease)： from Latin contagio（n-）, from con- 'together with' + the base of tangere 'to touch'.