Abstract
To the Editor: About a week after a quick trip to the Soviet Union I repaired to a clinical laboratory in New York City for a stool examination. The laboratory supervisor asked me where I had been, and when he heard I had spent four days in Leningrad and four days in Moscow, he said, "Giardia." And so it proved to be — I had a florid crop of Giardia lamblia in my intestines. Giardia is a flagellated protozoan of ambiguous pathogenicity — some claim it is a harmless sometime inhabitant of intestinal tracts throughout the world. I testify to . . .

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