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MCQs in Tropical Medicine

Rob Skelly DTM+H FRCP

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Answer 26


a. is usually spread by the faeco-oral route
b. is usually diagnosed by microscopy of adhesive tape prints taken from the perianal area
c. may block the pancreatic duct causing pancreatitis
d. eggs can be readily distinguished microscopically from those of Strongyloides sp.
e. commonly causes diarrhoea in non-immunes

ALL False

a. Hookworm is a soil transmitted helminth. The infective larvae (third stage larvae) survive in the soil for months. They penetrate intact skin and from there migrate via lymphatics and the bloodstream to the lungs. They then travel up the airways to the larynx and into the gut via the oesophagus.

b. The threadworm is diagnosed by microscopy of adhesive tape previously placed perianally

c. Ascaris lumbricoides is sometimes complicated by pancreatitis

d. The eggs of Necator americanus and Ancylostoma duodenale are indistinguishable on light microscopy.

e. Hookworm rarely, if ever, causes traveller's diarrhoea

Copyright: Rob Skelly 2006