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.
Surely, our leaders in Tallahassee can work out a budget to sustain the ADAP program statewide — especially for an infectious disease. Steve Bender, The Orlando Sentinel, 14 Mar. 2026 Nathan Shively, an infectious disease expert with Allegheny Health Network, shared tips on how people can protect themselves. Mamie Bah, CBS News, 14 Mar. 2026 But beyond these harms, the disease’s resurgence serves as a serious warning about the country’s capacity to manage infectious disease threats of all kinds. Andrea Uhlig, The Conversation, 12 Mar. 2026 In 2020, Bhattacharya, then a health economist at Stanford University without specialized training in infectious disease, co-authored the Great Barrington Declaration, an open letter that downplayed the risk of COVID and called for most of society to reopen before the arrival of vaccines. Katherine J. Wu, The Atlantic, 5 Mar. 2026 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 16 Mar. 2026.

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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