| [prevalence of hepatitis a and b in the population of valdivia: a seroepidemiological study]. | | 1984 | 6096951 |
| [prevalence of antibodies against hepatitis a in school children]. | as sanitary conditions of a population improve, hepatitis a virus infection occurs at higher ages, thus decreasing the prevalence of antibodies against the virus. in the eighties, the prevalence of antibodies among children was 97% and depended on the socioeconomic level. | 1998 | 10030086 |
| placebo-controlled efficacy study of hepatitis a vaccine in valdivia, chile. | a placebo-controlled, double-blind study on the efficacy of a hepatitis a vaccine (smithkline beecham biologicals) was started in a region of chile in september 1990, using hepatitis b vaccine as control. a total of 260 healthy children, 6-15 years of age, negative for antibody to hepatitis a virus (anti-hav), antibody to hav immunoglobulin m (igm), hepatitis b surface antigen, and antibody to hepatitis b surface and core antigens by elisa tests within 7 days before vaccination, were randomly as ... | 1992 | 1335650 |
| [current status of immunity to hepatitis a virus in various adult groups]. | as sanitary and economic conditions improve, the prevalence of antibodies to hepatitis a is now significantly lower. | 1999 | 10835731 |