Paragonimiasis patients usually discharge typical viscous sputa of rusty brown color which contain numerous eggs of paragonimus. The best method for the diagnosis of paragonimiasis is to find paragonimus eggs in such typical sputum. However, in the case of mass examination, we can not always obtain such a typical specimen of sputum from every patient. On the other hand, very frequently, patients swallow their sputa unconciously, and, as the result of this, it is possible to recover the eggs from their stool. Tominaga (1942) examined sputa and stools of the same patient at the same time on 50 cases and recovered paragonimus eggs in 99.4% of the sputa examined and 13.8 of the stool examined. Faust (1949) stated that eggs appear in the stools of about 40% of the patients having only pulmonary symptomes. The rate of recovering eggs from stools, however, would vary according to the method of the stool examination applied.
From the summer of 1950 to the winter of 1951, the authors had a chance of examining eggs of paragonimus in sputa and stools of the same person simultaneously on 35 paragonimiasis patients. The method used for stool examination was AMS III centrifuging technic.