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Rotavirus was looked for in stool specimens from 200 randomly chosen infants and children aged 1-24 months presenting with acute diarrhoea of not more than 5 days duration at the Bab El-Sha'reya University Hospital during a 12-month period (January-December 1986). Forty per cent of cases were positive for rotavirus by the ELISA technique. Considering the seasonal pattern, during the hot months May to August, the monthly percentage of rotavirus positive cases ranged from 24 to 32 per cent while during the rest of the year, the range was from 37 to 60 per cent. There was no statistically significant difference between the rotavirus positive and negative cases as regards mean age in months (9.5 +/- 5.1 and 9.2 +/- 5.5, respectively), type of feeding or nutritional status. However, rotavirus positive cases were significantly more likely to present earlier, to have watery stools, to vomit or even to have vomiting before the onset of diarrhoea and to have respiratory symptoms. On the other hand, the means of dehydration score, rectal temperature and serum Na+ were not significantly different between the two groups.

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