contagious

[kuhn-tey-juhs]

adjective

1. capable of being transmitted by bodily contact with an infected person or object.

   contagious diseases.

2. carrying or spreading a contagious disease.

3. tending to spread from person to person.

   contagious laughter.

contagious

/ kənˈteɪdʒəs /

adjective

1. (of a disease) capable of being passed on by direct contact with a diseased individual or by handling clothing, etc, contaminated with the causative agent Compare infectious

2. (of an organism) harbouring or spreading the causative agent of a transmissible disease

3. causing or likely to cause the same reaction or emotion in several people; catching; infectious

   her laughter was contagious

contagious

1. Capable of being transmitted by direct or indirect contact, as an infectious disease.

2. Bearing contagion, as a person or animal with an infectious disease that is contagious.

Usage

A contagious disease is one that can be transmitted from one living being to another through direct or indirect contact. Thus the flu, which can be transmitted by coughing, and cholera, which is often acquired by drinking contaminated water, are contagious diseases. Although infectious is also used to refer to such diseases, it has a slightly different meaning in that it refers to diseases caused by infectious agents—agents such as viruses and bacteria that are not normally present in the body and can cause an infection. While the notion of contagiousness goes back to ancient times, the idea of infectious diseases is more modern, coming from the germ theory of disease, which was not proposed until the later nineteenth century. Contagious and infectious are also used to refer to people who have communicable diseases at a stage at which transmission to others is likely.

Other Word Forms

• contagiously adverb
• contagiousness noun
• contagiosity noun
• anticontagious adjective
• anticontagiously adverb
• anticontagiousness noun
• noncontagious adjective
• noncontagiously adverb
• noncontagiousness noun
• uncontagious adjective
• uncontagiously adverb

Word History and Origins

Origin of contagious¹

First recorded in 1350–1400; Middle English, from Late Latin contāgiōsus, from contāgi(ō) contagion + -ōsus -ous

Synonym Study

Contagious, infectious are usually distinguished in technical medical use. Contagious, literally “communicable by contact,” describes a very easily transmitted disease as influenza or the common cold. Infectious refers to a disease involving a microorganism that can be transmitted from one person to another only by a specific kind of contact; venereal diseases are usually infectious. In nontechnical senses, contagious emphasizes the rapidity with which something spreads: Contagious laughter ran through the hall. Infectious suggests the pleasantly irresistible quality of something: Her infectious good humor made her a popular guest.

Example Sentences

You are contagious and can spread chickenpox to other people from two days before the first spots develop until they have all formed scabs, which is usually five days after they first appear.

From BBC

Sarah Williams, chairwoman of the Olympus trust, said: "Whether in the boardroom or walking the halls in our schools, he led with vision and a contagious passion."

From BBC

This made sense to the researchers: Fire is contagious, meaning a high-intensity fire with a lot of energy and momentum is likely to continue at a high intensity.

From Los Angeles Times

“I’m hoping this courage that my colleagues and I have shown will be contagious, and it’ll inspire other legislators in blue states to respond with their own redistricting attempts.”

From Salon

The virus is not contagious, and only spreads when an infected person is bitten by a mosquito that then goes on to bite others.

From BBC

Related Words

• deadly 
• endemic 
• infectious 
• poisonous 
• spreading www.thesaurus.com