1. able to be spread from one person to another through contact or close proximity
Usage: medical
2. spreading quickly from person to person in a non-physical way
Usage: figurative

Examples

• The flu is highly contagious during the first few days of illness.
• Children with chickenpox should stay home until they are no longer contagious.
• Her enthusiasm was contagious and soon everyone was excited about the project.
• The teacher’s positive attitude proved contagious among her students.
• Laughter can be contagious in a crowded room.
• The panic spread through the crowd like a contagious disease.
• His yawning became contagious during the boring meeting.