variants or less commonly polio virus
: an enterovirus (Entervirus coxsackiepol) occurring in three distinct serotypes that cause polio

Note: The poliovirus is typically transmitted orally by food, drink, or hands that are contaminated with infected fecal matter. The virus may sometimes be transmitted by the respiratory droplets or saliva of an infected individual. The poliovirus multiplies in the intestinal tract and sometimes spreads in the bloodstream throughout the body.

Examples of poliovirus 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.
Which parts of the world are seeing poliovirus circulation now? Katia Hetter, CNN Money, 11 Mar. 2026 Alarm bells sounded in August when a 10-month-old baby boy in the Gaza Strip was partially paralyzed by poliovirus. Saima S. Iqbal, Scientific American, 26 Sep. 2024 The oral polio vaccine, originally developed by Albert Sabin, uses a live but weakened poliovirus that one swallows in a sugar cube or droplet. William Petri, The Conversation, 22 July 2022 Centers for Disease Control and Prevention urges travelers to confirm vaccinations as poliovirus resurfaces across multiple countries. Eve Chen, USA Today, 5 Mar. 2026 See All Example Sentences for poliovirus

Word History

Etymology

polio- (in poliomyelitis) + virus, later taken as New Latin

First Known Use

1939, in the meaning defined above

Time Traveler
The first known use of poliovirus was in 1939

Browse Nearby Words

Cite this Entry

“Poliovirus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/poliovirus. Accessed 7 Jul. 2026.

Medical Definition

variants also polio virus
: a picornavirus (Enterovirus coxsackiepol) that occurs in three distinct serotypes that cause polio

Note: The poliovirus is typically transmitted orally by food, drink, or hands that are contaminated with infected fecal matter. The virus may sometimes be transmitted by the respiratory droplets or saliva of an infected individual. The poliovirus multiplies in the intestinal tract and sometimes spreads in the bloodstream throughout the body.

A distinctive characteristic of acute polio infection is the predilection of the poliovirus for the nerve cells that control muscles.Lauro S. Halstead, Scientific American

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