Abstract
To the Editor: In a recent article on epidemic giardiasis in the journal 1 reference was made to a possible outbreak of giardiasis in Oregon, of which no detailed report was available. A report of this outbreak was rejected by a journal on the basis of insufficient proof, and no further attempt was made to publish the findings. Because of the many similarities between the two outbreaks, and the scarcity of published accounts of such episodes, I am submitting a brief summary of the Oregon epidemic.From October, 1954, to March, 1955, an estimated 50,000 cases of gastroenteritis occurred in Portland, . . .

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