infectious disease

noun

: a disease (such as influenza, malaria, meningitis, rabies, or tetanus) caused by the entrance into the body of pathogenic agents or microorganisms (such as bacteria, viruses, protozoans, or fungi) which grow and multiply there compare communicable disease, contagious disease

Examples of infectious disease in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Most people who have been in bodies of waters have been exposed to the amoeba, but contact alone is not harmful, Dr. Anna Kathryn Burch, a pediatric infectious disease specialist at Prisma Health Children's Hospital Midlands, said during a news conference on July 22. Melina Khan, USA Today, 25 July 2025 Peter Chin-Hong, MD, an infectious disease specialist and a professor of medicine at the University of California San Francisco School of Medicine, notes that viral spread can take off in the warmer months as more people travel and come together indoors to escape extreme heat. Tom Gavin, EverydayHealth.com, 24 July 2025 As national cases of measles soar and federal health officials engage in vaccine skepticism, Illinois so far this year has seen only one small outbreak of the highly infectious disease that health officials say was quickly brought under control. Olivia Olander, Chicago Tribune, 11 July 2025 The Marion County Public Health Department has started hosting vaccination clinics in partnership with schools, said Melissa McMasters, administrator of the county’s immunization and infectious disease program. Jordan Smith, IndyStar, 2 July 2025 See All Example Sentences for infectious disease

Word History

First Known Use

1600, in the meaning defined above

Time Traveler
The first known use of infectious disease was in 1600

Browse Nearby Words

Cite this Entry

“Infectious disease.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infectious%20disease. Accessed 31 Jul. 2025.

Kids Definition

infectious disease

noun
: a disease caused by the presence, growth, and increase in numbers of germs in the body

Medical Definition

infectious disease

noun
: a disease (as influenza, malaria, meningitis, rabies, or tetanus) caused by the entrance into the body of pathogenic agents or microorganisms (as bacteria, viruses, protozoans, or fungi) which grow and multiply there compare communicable disease, contagious disease
Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!