: a group of biological taxa (such as species) that includes all descendants of one common ancestor
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The mechanism has been invoked eight times in twenty years, for H1N1 (2009), polio (2014), Ebola in West Africa (2014), Zika (2016), Ebola in Kivu (2019), COVID-19 (2020), mpox (2022), and mpox again for clade I (2024).—John Drake, Forbes.com, 19 May 2026 There are two strains, clade I and clade II but both are transmitted and treated in the same way, the CDC says.—Staff Report, Hartford Courant, 14 May 2026 Mpox is an illness caused by the monkeypox virus, which comes in two strains called clades, the Mayo Clinic said.—Don Sweeney, Sacbee.com, 21 Apr. 2026 One resident has tested positive for mpox clade I, one of the two main genetic groups (clades) of the mpox virus, which causes the illness.—Melissa Rudy, FOXNews.com, 16 Mar. 2026 See All Example Sentences for clade
Word History
Etymology
borrowed from Greek kládos "branch, sprig, frond," after cladogenesis — more at clado-
Note:
The term was introduced by Julian huxley in "The Three Types of Evolutionary Process," Nature, vol. 180, no. 4584 (September 7, 1957), p. 455.