infectious
US /ɪnˈfek.ʃəs/
UK /ɪnˈfek.ʃəs/
1.
able to be passed from one person, animal, or plant to another by infection
:
•
The common cold is an infectious disease.
•
Wash your hands frequently to prevent the spread of infectious germs.
2.
(of a feeling or quality) likely to spread to and affect others
:
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Her enthusiasm was infectious.
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He had an infectious laugh that made everyone smile.