post·​in·​fec·​tious ˌpōst-in-ˈfek-shəs How to pronounce postinfectious (audio)
: occurring after and especially as a result of an infection
postinfectious encephalitis
a postinfectious cough

Example Sentences

Recent Examples on the Web There are precedents for this kind of postinfectious, noncritical illness, such as posttreatment Lyme disease. Jennifer Couzin-frankel, Science | AAAS, 13 Apr. 2021 In other words, long Covid may simply be the latest example of a postinfectious phenomenon that has mystified physicians for more than a century. New York Times, 21 Jan. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'postinfectious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1895, in the meaning defined above

Time Traveler
The first known use of postinfectious was in 1895

Dictionary Entries Near postinfectious

Cite this Entry

“Postinfectious.” Dictionary, Merriam-Webster, Accessed 9 Feb. 2023.

Medical Definition


post·​in·​fec·​tious -in-ˈfek-shəs How to pronounce postinfectious (audio)
variants or post-infectious
: relating to or occurring in the period following infection : caused by a previous infection
postinfectious syndromes
Estimates of the annual incidence of idiopathic or postinfectious transverse myelitis range from 1.3 to 8 cases per million.Elliot M. Frohman et al.
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