Related topics: Illness and Disability
a disease that is contagious can be passed from person to person by touch
a person who is contagious has a disease that can be passed to another person by touch:
The patient is still highly contagious.
if a feeling, attitude, or action is contagious, other people are quickly affected by it and begin to have it or do it:
her contagious enthusiasm
—contagiousness noun [uncountable]