Which parasite produces an elongated, barrel-shaped egg measuring 50 by 22 μm with a colorless polar plug at each end?

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Prepare for Success! In Clinical Laboratory Science with our Parasitology Test. Study with flashcards, multiple choice questions, hints, and explanations. Boost your readiness for the exam!

Multiple Choice

Which parasite produces an elongated, barrel-shaped egg measuring 50 by 22 μm with a colorless polar plug at each end?

Explanation:
Recognizing eggs by distinctive shape and size is key. An elongated, barrel-shaped egg with colorless polar plugs at both ends, about 50 by 22 μm, is the classic appearance of whipworm eggs. That barrel form with bipolar plugs is so characteristic that it points directly to Trichuris trichiura. Other common eggs don’t show this combination: Ascaris lumbricoides eggs are ovoid with a knobby (mammillated) outer shell; Necator americanus eggs are thin-shelled and often contain a developing embryo without polar plugs; Hymenolepis nana eggs are smaller and ovoid with a different shell and internal content.

Recognizing eggs by distinctive shape and size is key. An elongated, barrel-shaped egg with colorless polar plugs at both ends, about 50 by 22 μm, is the classic appearance of whipworm eggs. That barrel form with bipolar plugs is so characteristic that it points directly to Trichuris trichiura.

Other common eggs don’t show this combination: Ascaris lumbricoides eggs are ovoid with a knobby (mammillated) outer shell; Necator americanus eggs are thin-shelled and often contain a developing embryo without polar plugs; Hymenolepis nana eggs are smaller and ovoid with a different shell and internal content.

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