CASE: 4 years old boy from Califonia, USA. No other history provided. Particles found from stool are 100 x 50 micrometers.
CORRECT ANSWER: Macracanthorhynchus sp. egg. The main Macracanthorhynchus species that infects humans is M. hirudinaceous, although a second species, M. ingens, can also rarely infect humans, and the eggs of the two cannot be differentiated microscopically.
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