Contagion

The transmission of a disease from one person to another, by direct or indirect contact.

That which serves as a medium or agency to transmit disease; a virus produced by, or exhalation proceeding from, a diseased person, and capable of reproducing the disease.

The act or means of communicating any influence to the mind or heart; as, the contagion of enthusiasm.

Venom; poison.

an incident in which an infectious disease is transmitted

the communication of an attitude or emotional state among a number of people; "a contagion of mirth"; "the infection of his enthusiasm for poetry"