Causing or capable of causing infection by spreading pathogens.
Examples:
Laughter is infectious, spreading smiles across the room.The enthusiasm of the team was totally infectious.Her creativity is infectious, inspiring everyone around her.
Synonyms:
Antonyms:
Contagious
/kənˈteɪdʒəs/
Able to spread from one person or organism to another by direct or indirect contact
Examples:
Her enthusiasm for the project was contagious.Laughter can often be surprisingly contagious.Yawns are known to be incredibly contagious.
Synonyms:
Antonyms:
This word has no antonyms
Ways to tell them apart:
Contagious is often used to describe a disease that can be transmitted through direct contact or close proximity.
Infectious is a broader term that refers to diseases caused by microorganisms, which may or may not be easily spread to others.
All contagious diseases are infectious, but not all infectious diseases are contagious.
Infectious diseases include diseases caused by bacteria, viruses, fungi, etc., while contagious specifically refers to the transmission aspect.
Remember, contagion is about contact and spreading, while infection is about the presence of pathogens.