General Introduction . Human intestinal nematode of smaller size inhabit the small intestine . o World-wide distribution about 900 million infections in the world ,o A duodenale is prevalent in Southern Europe, North Africa, Northern Asia(North China), and the more pathogenic one .o N americanus is the predominant species in the Western hemisphere and equatorial Africa(South China gs Many areas are endemic for both species o'o Heaw infection may evoke anemia known as Yellow LazinessGeneral Introduction ❖ Human intestinal nematode of smaller size, inhabit the small intestine ❖ World-wide distribution, about 900 million infections in the world ❖ A. duodenale is prevalent in Southern Europe, North Africa, Northern Asia (North China), and the more pathogenic one ❖ N. americanus is the predominant species in the Western hemisphere and equatorial Africa (South China) ❖ Many areas are endemic for both species ❖ Heavy infection may evoke anemia known as "Yellow Laziness