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Giardia
Giardia
( or ) is a
genus
of
anaerobic
flagellated
protozoan
parasites
of the phylum Sarcomastigophora that colonise and reproduce in the small intestines of several
vertebrates
, causing
giardiasis
. Their life cycle alternates between an actively swimming
trophozoite
and an infective, resistant
cyst
.
Giardia
were first described by the
Dutch
microscopist
Antonie van Leeuwenhoek
in 1681. The genus is named after French zoologist
Alfred Mathieu Giard
.
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