| racial differences in the seroprevalence of hepatitis a virus infection in natal/kwazulu, south africa. | the age- and race-specific seroprevalence of hepatitis a virus (hav) infection was determined by radioimmunoassay (ria) in 786 subjects between the ages of 6 months to 60 years. more than 50% of african children were seropositive by the age of 5 years. in blood donors (17-60 years), 50% (93/187) of whites, 67% (110/163) of indians, 85% (117/137) of coloureds, and 91% (115/127) of africans were seropositive. there was a significant difference in the seroprevalence of hav infection between white b ... | 1994 | 7798891 |
| seroepidemiological study of helicobacter pylori infection in south african children. | the seroepidemiology of helicobacter pylori infection was studied in 681 randomly selected black children from newborn to 13 years of age (333 boys, mean age 8.05 years, and 348 girls, mean age 7.76 years) in kwazulu/natal, south africa. h. pylori infection was identified serologically using an enzyme-linked immunosorbent assay to detect the presence of immunoglobulin g against h. pylori. demographic information collected included age, gender, family income, overcrowding, educational level, and ... | 1997 | 9373630 |