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Listeria
Listeria
is a
genus
of
bacteria
that contains 10 species, each containing two subspecies. Named after the
British
pioneer of sterile surgery
Joseph Lister
, the genus received its current name in 1940.
Listeria
species are
gram-positive
,
rod-shaped
,
facultatively anaerobic
, and non
spore
-forming. The major
human pathogen
in the
Listeria
genus is
L. monocytogenes
. It is usually the causative agent of the relatively rare bacterial disease
listeriosis
, a serious
infection
caused by eating food
contaminated
with the bacteria. The disease affects
pregnant women
,
newborns
, adults with
weakened immune systems
, and the
elderly
.
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