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Am. J. Trop. Med. Hyg., 64(5), 2001, pp. 293-297
Copyright © 2001 by The American Society of Tropical Medicine and Hygiene

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American Journal of Tropical Medicine and Hygiene, Vol 64, Issue 5, 293-297
Copyright © 2001 by American Society of Tropical Medicine and Hygiene

Research Articles


Multiplex polymerase chain reaction amplification and differentiation of Entamoeba histolytica and Entamoeba dispar DNA from stool samples

YO Nunez, MA Fernandez, D Torres-Nunez, JA Silva, I Montano, JL Maestre, and L Fonte

Due to the clinical importance of differentiating the two species of the Entamoeba histolytica/Entamoeba dispar complex, we developed a multiplex polymerase chain reaction (PCR) method that overcomes time-consuming and laborious procedures. We report here a DNA extraction protocol using non-fixed stool samples that avoid long lysis-incubation periods through the combined use of zirconium beads and a lysis-supporting buffer. We characterized 49 of 52 stool specimens from Cuban patients with amoebiosis. Among them, 36 (75.5%) were infected only with E. dispar (the nonpathogenic species), while 13 (24.5%) displayed a mixed infection with both E. dispar and E. histolytica. The multiplex PCR protocol showed a specificity of 1.00 and a sensitivity of 0.94. Furthermore, the entire procedure can be performed in one day. This approach is therefore reliable and applicable in the field for epidemiologic studies.


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Copyright © 2001 by the American Society of Tropical Medicine and Hygiene.