Abstract
Entamoebapolecki is a parasite of human and nonhuman primates, other mammals, and birds. Due to overlapping morphological features, cysts of E. polecki may be confused with those of other Entamoeba species commonly found in human fecal samples, including immature cysts of Entamoeba histolytica Although the presence of E. polecki in human Entamoeba-positive stool samples may be rare, its prevalence is likely underestimated due to such confusion. Here, we give examples of diagnostic approaches applied so far and summarize data on the molecular epidemiology of E. polecki, including host specificity and phylogeography. Moreover, we evaluate a novel diagnostic conventional PCR developed for the screening of fecal samples for E. polecki The assay was highly sensitive and specific when used on genomic DNA extracted directly from stool and Swedish wastewater samples. The PCR enabled the identification of all four subtypes (ST1 to ST4) of E. polecki by PCR product sequencing. Most (23/28) subtyped E. polecki-positive samples detected in patients in Sweden between 2002 and 2015 reflected colonization by ST4 and were seen in travelers/foreigners. Two and three human cases of ST2 and ST3, respectively, were also detected. Subtypes 1, 2, an...Continue Reading
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