During the past seven years the researches of Schaudinn,1 Viereck,2 Hartmann and Prowazek,3 Wenyon,4 and others have demonstrated the existence of at least three species of amebas which are parasitic in the intestine of man. In 1903, Schaudinn extended the previous investigations of Casagrandi and Barbagallo,5 and Jurgens,6 and distinguished two species of amebas parasitic in the human intestine, placing them in the genus Entamœba, established by Casagrandi and Barbagallo. To one species, which he found in a large proportion of healthy individuals, as well as in diseases other than dysentery, he gave the name Entamœba coli; while to the other, which he found in patients suffering from dysentery, he gave the name Entamœba histolytica. In 1905, while working on the amebas present in soldiers invalided home from the Philippines because of amebic dysentery, I was able to confirm Schaudinn's work,
CRAIG CF. ENTAMCEBA TETRAGENA AS A CAUSE OF DYSENTERY IN THE PHILIPPINE ISLANDS. Arch Intern Med (Chic). 1911;VII(3):362–366. doi:10.1001/archinte.1911.00060030075004
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