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The infectivity and invasiveness of four non-invasive strains of Entamoeba histolytica was not altered by inducing encystation in the cultures. The virulence of one strain, RD, dropped until it was non-invasive though the infectivity remained at a high level. From these results it is concluded that invasiveness is independent of encystation.
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R.A. Neal (1954) studied this question.
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