You see flagellated cells in a microscopic examination of feces from a patient with diarrhea. You conclude that the etiology is __________.
Question
You see flagellated cells in a microscopic examination of feces from a patient with diarrhea. You conclude that the etiology is __________.
Solution
The observation of flagellated cells in feces is commonly associated with certain protozoan infections. The presence of these cells suggests an infection by a flagellate organism, such as Giardia lamblia. Giardia is known to cause gastroenteritis or "traveler’s diarrhea," which is characterized by symptoms such as diarrhea, abdominal cramps, and bloating.
In summary, when flagellated cells are seen in a microscopic examination of feces from a patient undergoing diarrhea, it is reasonable to conclude that the etiology is Giardia lamblia infection. Other flagellated protozoa, like Trichomonas vaginalis (which typically does not present in fecal samples), are less likely associated with gastrointestinal symptoms in this context. Thus, the best completion of the sentence is:
"the etiology is Giardia lamblia."
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