Xenodiagnosis is an effective technique that is akin to the technique of bloodletting with leeches that dates back to the Middle Ages.
In this test, uninfected vinchucas are placed in a jar and tucked under the armpit of a patient suspected of being infected.
The vinchucas are allowed to consume blood for thirty minutes, and their feces are examined for T. cruzi thirty and sixty days afterward.
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