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:
Infectious often relates to the nature of a disease and its ability to enter and multiply in a host or spread, whereas contagious focuses more on the ease with which a disease is passed from person to person.
Contagious diseases require direct or indirect contact to spread, like touching or breathing the same air, while infectious encompasses a broader range, including those transmitted through vectors like mosquitoes.
To remember: All contagious diseases are infectious, but not all infectious diseases are contagious.
Infectious can also encompass non-contagious diseases, like food poisoning or tetanus, which are contracted but not passed from person to person.
Contagious is more about the social aspect of disease spread, i.e., how one should act to prevent passing the disease to others.