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Microbiology

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Helminthology

Question
19 out of 100
 

Dracunculosis is acquired by;



A Ingestion of water containing Cyclops

B Ingestion of water containing the parasite.

C Ingestion of fish.

D Penetration of skin

Ans. A Ingestion of water containing Cyclops

a. Guinea worm infection or dracunculosis is acquired by ingestion of water containing Cyclops.

b. The infective form for man (definitive host) is the 3rd stage larva present in Cyclops (intermediate host).

c. The larvae develop for approximately two weeks inside the copepods. At this stage the larvae can cause guinea worm disease if the infected copepods are not filtered from drinking water.

d. Once inside the body, stomach acid digests the copepod, but not the guinea worm larvae that are sheltered inside.

e. These larvae find their way to the body cavity where the female mates with a male guinea worm. This takes place approximately three months after infection. The male worm dies after mating and is absorbed.

f. The female, which contains larvae, burrows into the deeper connective tissues or adjacent to long bones or joints of the extremities.

g. Approximately one year after the infection began, the worm creates a blister in the human host's skin—usually on the leg or foot.

h. Within 72 hours the blister ruptures, exposing one end of the emergent worm. This blister causes a very painful burning sensation as the worm emerges. Infected persons often immerse the affected limb in water to relieve the burning sensation.

i. Once the blister or open sore is submerged in water, the adult female releases hundreds of thousands of guinea worm larvae, contaminating the water supply.

Helminthology Flashcard List

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