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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
In 2023, tuberculosis overtook COVID-19 as the most deadly infectious disease, with 1.25 million people who died from infections.
—Eduardo Cuevas, USA TODAY, 29 Jan. 2025
In 2024, there were 65 active tuberculosis cases in Wyandotte County and 14 in Johnson County, according to the Kansas Department of Health and Environment’s infectious disease dashboard.
—Eleanor Nash, Kansas City Star, 28 Jan. 2025
As the head of HHS, there's a whole host of ways that Kennedy could change the landscape of childhood vaccines in the U.S., which infectious disease experts say could lead to a resurgence of infectious diseases among children, including meningitis and polio.
—Selena Simmons-Duffin, NPR, 28 Jan. 2025
Babies have the best chance of avoiding complications from syphilis if their mothers get treatment at least 30 days before their birth, said Dr. Sara Saporta-Keating, an assistant professor of pediatrics specializing in infectious disease at University of Colorado’s School of Medicine.
—Meg Wingerter, The Denver Post, 28 Jan. 2025
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Word History
First Known Use
1600, in the meaning defined above
Time Traveler
The first known use of infectious disease was
in 1600
Dictionary Entries Near infectious disease
Cite this Entry
“Infectious disease.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infectious%20disease. Accessed 1 Feb. 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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