Blastocystis hominis is now getting acceptance as an agent of human intestinal disease. B. hominis in stool samples of symptomatic and asymptomatic individuals was evaluated as a possible cause of gastro-intestinal troubles. B. hominis was found in 106 (10.1%) out of 1050 individuals examined from six villages and one city in Talkha Center, Dakahlia Governorate. The highest infection rate was in Manshayt El-Badawy village (25.47%), whereas Talkha City showed the lowest rate (4.73%). Age group 10-20 years had higher infection (13.3%). In twenty-three symptomatic patients, B. hominis represented the only causative parasitic agent. The most common symptoms were diarrhoea (30.4%), abdominal pain (26.1%), flatulence (21.7%). vomiting (13.1%) and fatigue (8.7%). High concentrations of B. hominis were found in symptomatic patients than in asymptomatic ones with statistical significant difference (8.2 cells/100 x field versus 3.8 respectively). The mean number of B. hominis was significantly high in patients complaining of diarrhoea and abdominal pain.
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