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Am. J. Trop. Med. Hyg., s1-31(2), 1951, pp. 192-205
Copyright © 1951 by The American Society of Tropical Medicine and Hygiene

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Comparative Growth Cycles of Endamoeba Histolytica with Different Combinations of Bacteria1,2,

William Balamuth AND Mary Louise Wieboldt

1. The mixed bacterial flora accompanying our culture of the NRS strain of E. histolytica was analyzed into its components: Escherichia coli communior (NRS-I), E. coli anaerogenes (NRS-IA), and an unnamed paracolon bacillus (NRS-II).
2. A series of monobacterial cultures were established by chemical treatment of cysts with 1:50,000 mercuric chloride for 90 minutes at 4°C.
3. E. histolytica was established separately with the following bacteria in aqueous eggyolk infusion: NRS-II, NRS-I, Aerobacter aerogenes, E. coli communis, Proteus vulgaris, Aerobacter cloacae, Kurthia zenkeri, Streptococcus equinus, S. faecalis, and S. liquefaciens.
4. Populations of bacteria and amebas were plotted in the form of growth curves for the first six types listed above, with the relative growth response of the amebas in the same order as the above list. No correlation could be observed between the relative ranking of bacterial and amebic growth, and within rather wide limits no controlling influence of inoculum could be determined.
5. The highest growth response of the amebas was obtained with the original mixed flora.


1 This is the second in a series of biological studies on Endamoeba histolytica.


2 From the Department of Biological Sciences, Northwestern University, Evanston, Illinois. This investigation was supported by grants from the Graduate School and Abbott Fund of Northwestern University.






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Copyright © 1951 by the American Society of Tropical Medicine and Hygiene.