Definition of infectious
Examples of infectious in a Sentence
viruses and other infectious agents
She has an infectious grin.
Recent Examples of infectious from the Web
The method will speed up immune matching for organ transplant and other purposes such as treating infectious and autoimmune diseases, the scientists say.
Jett said the Herpes B virus is incredibly infectious.
If a tick is crawling on the skin or is quickly removed, the chance of transmission of any infectious disease is extremely unlikely.
The idea behind an emergency fund is not to displace efforts to combat infectious disease but to ramp them up to meet a crushing temporary need.
In North Korea, the focus is on infectious disease and physical trauma, often caused by coal-mining injuries.
Dr. Fred Silverblatt, the infectious-disease doctor Jenckes consulted, didn’t think the subtle findings could be the cause of her symptoms.
Among infectious diseases, flu is considered one of the U.S.’s leading killers.
Fighting emerging infectious diseases costs billions of dollars, as the AIDS pandemic and the recent Ebola epidemic in West Africa attest.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infectious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of infectious
INFECTIOUS Defined for English Language Learners
Definition of infectious for English Language Learners
: capable of causing infection
: capable of being passed to someone else by germs that enter the body
: suffering from a disease that can be spread to other people by germs
INFECTIOUS Defined for Kids
Definition of infectious for Students
1 : passing from one to another in the form of a germ an infectious illness
2 : easily spread to others an infectious laugh
Medical Definition of infectious
1: capable of causing infection a carrier remains infectious without exhibiting signs of disease viruses and other infectious agents
2: communicable by invasion of the body of a susceptible organism all contagious diseases are also infectious, but it does not follow that all infectious diseases are contagious—W. A. Hagan—compare contagious 1
Seen and Heard
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