Abstract
Conclusions
1) A search for the encystment promoter amongst the organisms comprising a bacterial complex “M” which fosters cyst formation in vitro of E. histolytica has been made. 2) From study of one line of amoebae “A” it appeared that organism c was essential, but that no one organism (including c) could by itself promote cyst production. Some balance or combination of products or conditions appears to be the requirement. There is a suggestion that one organism (f) may in some way be antagonistic to cyst formation. 3) Another line of amoebae “L” gave similar results to “A” but certain additional combinations of 5 organisms gave cysts. This may indicate a strain difference but, because of the small numbers of cysts found in all tests, we feel that the observation requires verification.
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