contagious
US /kənˈteɪ.dʒəs/
UK /kənˈteɪ.dʒəs/

1.
contagioso
describing a disease that can be spread from one person or organism to another by direct or indirect contact
:
•
The flu is highly contagious.
L'influenza è molto contagiosa.
•
Measles is a highly contagious viral disease.
Il morbillo è una malattia virale altamente contagiosa.
2.
contagioso
describing an emotion or attitude that spreads quickly to others
:
•
Her enthusiasm was contagious.
Il suo entusiasmo era contagioso.
•
His laughter was so contagious that soon everyone in the room was smiling.
La sua risata era così contagiosa che presto tutti nella stanza sorridevano.