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.
In Massachusetts, however, public health officials had just clocked the first case in a brand-new infectious disease outbreak. Matt Alderton, USA Today, 14 June 2025 Ross, who also works on infectious disease forecasting and serves as executive director of rOpenSci, a project that focuses on improving the R programming language, sees Grant Watch as a kind of data journalism project—one that enables rather than replaces traditional reporting. John Drake, Forbes.com, 13 June 2025 The study also didn’t account for different dosages in the Pfizer and Moderna vaccines, noted Dr. Peter Hotez, a pediatrician and infectious disease expert who is co-director of the Center for Vaccine Development at Texas Children’s Hospital. Sarah Owermohle, CNN Money, 13 June 2025 In fact, according to Stanford infectious disease expert Jake Scott, every vaccine has been tested against some form of placebo; some in use today had been tested against earlier versions of the shot, which themselves had been tested against placebo. Michael Hiltzik, Los Angeles Times, 17 June 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 26 Jun. 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
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