| age-specific prevalence of hepatitis a antibody in thai children. | age-specific prevalence of anti-hav was determined for 3 groups of children whose mean ages were 12.6, 20.7 and 52.5 months. there were 41, 43 and 99 children in the respective age groups. all children were healthy, from middle to low socioeconomic families in bangkok and vicinity. none of the children in the two younger age groups had anti-hav antibody while 2 of 99 children in the oldest age group did. one of them resided in central bangkok (amphoe dusit) and the other in nonthaburi province. ... | 1995 | 9139381 |
| age-specific prevalence of hepatitis a virus antibody in thailand. | serum specimens drawn at random from three geographically defined populations of healthy thais were tested for antibody to the hepatitis a virus (anti-hav) by radioimmunoassay. a total of 746 specimens were tested. the age by which 50 per cent were antibody positive was 4-5 years for residents of an urban bangkok housing project, 8-9 years for rural villagers, and 10-11 years for urban bangkok government school pupils. overall, specimens from 97 per cent of thai adults 16 years of age or older w ... | 1981 | 6258428 |
| viral hepatitis markers in thai blood donors. | 1,410 voluntary blood donors from bangkok were investigated by radioimmunoassay for hbsag, anti-hbs, anti-hbc, hbeag, anti-hbe and anti-hav. an hbsag carrier state was observed in 10.7% of whom 42.1% were hbeag positive and 40.2% had anti-hbe. antibody prevalences (except anti-hbe) rose with increasing age. the occurrence of hepatitis markers did not vary significantly between donors living along the canals and those living in the greater bangkok area. | 1984 | 6331008 |
| the declining transmission of hepatitis a in thailand. | hepatitis a antibody was almost universal among thai children 10-15 years ago. to assess whether transmission of hepatitis a among thai children had declined, contemporary antibody prevalence and seroconversion rates were determined. antibody prevalence in 1987-1988 among children in bangkok declined since 1977 for all ages studied, most markedly among young children. among 453 low-income urban schoolchildren, there were no seroconversions over a 10- to 12-month period (95% confidence interval [ ... | 1991 | 1850444 |
| detection of poliovirus, hepatitis a virus and rotavirus from sewage and water samples. | a modified adsorption-elution technique for concentration of enteric viruses from sewage and water samples was developed. the viruses in water were concentrated by negatively charged membrane filtration, eluted with 2.9% tryptose phosphate broth containing 6% glycine ph 9.0, and reconcentrated using centrifugation by a speedvac concentrator. the presence of poliovirus, hepatitis a virus (hav) rna, and rotavirus antigen was determined by cell culture isolation, nested polymerase chain reaction (n ... | 2000 | 11023063 |