Acute Diarrhoea and Asymptomatic Infection in Chilean Preschoolers of Low and High Socio-economic Strata

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Abstract
Preschoolers who belonged to the high (Group I, n = 112) or the low (Group II, n = 90) socioeconomic stratum were followed prospectively for six months. Mean monthly incidence of diarrhea was 3 and 7 episodes per 100 children for Group I and Group II respectively (p < 0.001). Episodes were shorter and affected a smaller proportion of children in Group I (P < 0.002) and p < 0.05), respectively). Bacterial enteropathogens were recovered in 12.6% and 13.5% of the episodes in Group I and Group II and parasites in 15.4% and 62.8%, respectively. Rotavirus was detected once in each group. Asymptomatic carrier rates for enteropathogenic bacteria were 12.0% in Group I and 7.2% in Group II. The corresponding figures for parasites were 28.2% and 62.8% (p < 0.001). Nutritional status was normal in all children. These results suggest that socio-economic stratum plays an important role in the characteristics of diarrheal illness in the groups which conform the population of the less developed countries. Acute diarrhea is less frequent in preschoolers living in Santiago than in other developing areas. Rates of asymptomatic infection are high.