lower respiratory tract
noun
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
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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
Cite this Entry
“Lower respiratory tract.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lower%20respiratory%20tract. Accessed 29 Jul. 2025.
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