lower respiratory tract


plural lower respiratory tracts
: the part of the respiratory tract including the trachea, bronchi, and lungs compare upper respiratory tract

Examples of lower respiratory tract in a Sentence

Recent Examples on the Web Overall the efficacy rates were pretty impressive: GSK’s vaccine was about 83 percent effective at preventing infection in the lower respiratory tract in adults 60 and older and 94 percent effective at preventing severe disease. Josh Fischman, Scientific American, 15 Mar. 2023 The panel voted unanimously in favor of the vaccine’s effectiveness in preventing lower respiratory tract disease caused by RSV in adults aged 60 and above, and voted 10 to 2 for its safety. Ed Silverman, STAT, 2 Mar. 2023 The Pfizer vaccine was 66.7% effective at preventing moderated lower respiratory tract illness with two or more symptoms and 85.7% effective at preventing illness with three or more symptoms, according to an FDA briefing document. Janelle Chavez, CNN, 28 Feb. 2023 Sanofi’s monoclonal antibody for infants and toddlers A monoclonal antibody from Sanofi and AstraZeneca, called nirsevimab, helps prevent RSV lower respiratory tract disease in newborns and infants entering or during their first RSV season. Adrianna Rodriguez, USA TODAY, 23 Feb. 2023 The vaccine was shown to be 94% effective against severe lower respiratory tract disease associated with an RSV infection in adults aged 60 and older, according to trial data. Abigail Adcox, Washington Examiner, 22 Feb. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'lower respiratory tract.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1881, in the meaning defined above

Time Traveler
The first known use of lower respiratory tract was in 1881

Dictionary Entries Near lower respiratory tract

Cite this Entry

“Lower respiratory tract.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lower%20respiratory%20tract. Accessed 7 Dec. 2023.

Medical Definition

lower respiratory tract

: the part of the respiratory tract including the trachea, larynx, trachea, bronchi, and lungs compare upper respiratory tract
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