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Of the three species of  Entamoeba  found in swine, namely  E. histolytica ,  E. polecki  and  E. suis ,  E. histolytica  can also infect humans, producing colitis or abscesses of liver and leading to death. However, the pathogenicity of other species of  Entamoeba  has not been fully characterized. Here, we conducted histopathology and molecular surveys on a pig farm where piglets had blackish feces or muddy diarrhea. Histopathological examination of two piglets showed necrosis of the mucous surface at the ileum, cecum, or colon, infiltration of neutrophils, and formation of ulcers. Based on morphological characteristics,  E. polecki  and  E. suis  trophozoites were mainly detected at lamina propria and surface of the lesion, respectively, and  Lawsonia intracellularis , a bacterial pathogen, was also detected. Molecular analysis using the small subunit ribosomal RNA gene on other piglets and a sow revealed infection with both  E. polecki  and  E. suis . These findings corroborate our previous reports that the two  Entamoeba  spp. are pathogenic in pigs as aggravations of symptoms with  L. intracellularis . This is the first report about mixed infection with  E. polecki  and  E. suis .

First report of mixed Entamoeba polecki (ST 1) and E. suis infection in piglets shedding abnormalfeces by histopathological and molecular surveys