Bradyzoite

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Bradyzoite (from Greek brady=slow and zōon=animal) is a sessile (slow-growing), form of a zoonotic microorganism, typically, Toxoplasma gondii, including others responsible for parasitic infections. In chronic (latent) toxoplasmosis, bradyzoite microscopically presents as clusters enclosed by an irregular crescent-shaped wall (a pseudocyst), in infected muscle and brain tissues.

Bradyzoite is the antonym of tachyzoite, which is a stage of rapid growth.