known to be involved in postweaning wasting (Ellis et al. 1998, Järveots et al. 2016). Salmonellosis, particularly that associated with Salmonella Typhimurium and Salmonella Choleraesuis, can occur concurrently with PMWS (Ha et al. 2005). The enteric protozoan parasites Entamoeba spp., especially E. histolytica, E. polecki (Matsubayashi et al. 2015a, 2015b, 2016), and E. suis (Matsubayashi et al. 2014), were recently identified as the causative agent of diarrhea in pigs. E. polecki can be classified into four subtypes (ST1-ST4) by polymerase chain reaction (PCR) and nucleotide sequencing of the small-subunit ribosomal
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