Abstract
Until the report by Aguilar1of forty cases ofBalantidiuminfection treated successfully with acetarsone, the treatment of this most serious infection was in a most unsatisfactory state. When our first case appeared, some time before Aguilar's report, the only suggestions available were to treat as for amebic dysentery, and the mortality was given as 30 per cent. Since two of our cases remained positive forBalantidiumafter treatment with acetarsone, I considered the sucessful treatment of these twelve cases as worthy of record. OCCURRENCE In a total of about 8,000 stool examinations in Chiengmai, Siam, this parasite was found only fourteen times. Twelve of these cases occurred in 1925 and within three months of that year. SYMPTOMATOLOGY In three cases the first symptom of disease was a fairly severe hemorrhage from the bowel occurring when the patient went to stool. One patient had only the initial hemorrhage, one

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