Since the prediction of Stiles1 that Hymenolepis nana would prove to be a common intestinal parasite in the United States, cases have been reported with increasing frequency, and the indications are that it is the most common tapeworm in many parts of the United States.
Ransom2 compiled the United States cases up to 1904, reporting twenty-five cases, all but one of the twenty-five having been reported after 1902.
Deaderick,3 in reporting two new cases in 1910, found that the number had reached thirty-three.
Schloss4 in the same year reported twenty cases of Hymenolepis nana in 280 children examined for intestinal parasites and only five cases of Tenia saginata.
Amesse5 reported one case from Professor Howland's service at Bellevue Hospital.
M. A. Wood6 reported three cases of Hymenolepis nana from Houston, Texas.
Bass and Gage7 reported fifteen cases out of 577 persons examined in New Orleans, and only three cases of