الفهرس 
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Abstract
Listeriosis is one of the mast recently recognized and lea6t understood of all the bacterial infections of man as
well as domestic animals and wildlife.
Although more than aix decades ha~e passed since Murray et al (192ij) first de6criped in detail the bacterium known
today as Listeria monocytDgenes, little is kho~n about this bacterium and it~ associ6ted hosts. However, recent advances in ~he ta~onomy of th~ genus Listerie have cl~rified the
picture of this ~eterogeneo~s group af bact~ria (Seeliger ~nd Janes, 1986). Seven specie6 of listeria are nuw
r€cognized namely Li~terla monocytogenes, Li$terlG ivanovii,
LisLeri~ seeligeri, Lis-teriil grayi, Listeria innocud, Listeria w81shimeri and List~ria murrayi. only Listeri8
mDnD~ytog8n8s is presently con5ide~ed the most recognized
anilaal and hUlMUJ pathogen. other occasional pathogen5
including Listeria ivanovii, Listeria seeligeriJ List6ri~
grayi and Listeria welshimeri have been documented recently
to have caused infectionB i~ animalG and man {BnB~h, 1~1l;
ROCQurt et aI, 1986 aDd ~Ddre & C8nioot, 198’).
!N’eD thtlugh ~t~ria monocytogenes is apparently distributed widely, ~e sporadic occurrence of: the vilriou~
forms of listeric i~ction 6Ugge5tS that its diatribution in nature is 5ctu~~11’re6tricted by unknown factors.