Difference between Ancylostoma duodenale and Necator americanus

Collection of Medicine MCQs (Cardiovascular system) for medical students. Concept based MCQs with detailed explanations which help students to gain valuable insights and gain an edge in competitive examinations. More than just answering MCQs, the explanations will improve the knowledge and understanding about the conditions discussed. Also useful for MD students who are preparing for Superspeciality entrance examinations. Medicine MCQs - Cardiovascular System Kindle Edition: Click Here for a Preview. Comments and suggestions are most welcome.
Ancylostoma duodenale Necator americanus
First identified in Italy First identified in Texas, USA
Old world hookworm New world hookworm
Larger (male 8-11mm) Smaller (male 7-9mm)
Anterior end bent in same direction of general curvature of body Anterior end bent in opposite direction of general curvature of body
Prominent buccal capsule with 2 pairs of teeth Smaller buccal capsule with 2 pairs of semilunar cutting plates
Vulva opens at junction of middle and posterior 1/3 Vulva opens a little in front of the middle
Copulatory spicules not fused Copulatory spicules fused at ends to form a barbed tip
Lifespan 2-7years Lifespan 4-20yrs
Ground itch less common Ground itch more common
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