infectiousness
noun/ɪnˈfekʃəsnəs/
/ɪnˈfekʃəsnəs/
[uncountable]- the ability of a disease to be passed easily from one person to another, especially through air or water
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- the fact that somebody's actions or feelings cause other people to do or feel the same
- the infectiousness of his humour
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infectiousness