[The surveillance on the present situation of immune levels of 1044 children vaccinated with seven kinds of vaccines in Dali Prefecture].

A total of 1044 children selected in age groups of 4, 8 and 12 years old from 12 countries (cities) with stratified random sampling method were monitored on the present situation of immune levels according to the programme on immunization in 1991. The results showed that the positive rates and the geometric mean titers of antibodies to measles were 87.16% +/- 3.14%, 5.83 +/- 0.41 (56.90%, < 1:8), respectively; to pertussis were 78.13% +/- 9.19% 218.10 +/- 23.39 (41.62%, > or = 1:320); to DAT were 74.4% +/- 11.04%, 0.098 +/- 0.025; to TAT were 75.86% +/- 11.09%, 0.136 +/- 0.03; to poliomyelitis (ELISA) were type I 89.99%, 220.51, type II 83.38%, 201.27, type III 86.09%, 275.08, 3 types 79.48%, 255.91 (27.23%, > or = 1:400); to Japanese B encephalitis (HI) were 67.47% +/- 3.34%, 39.44 +/- 1.48. The conversion of OT was 24.73%. It showed significant difference among these counties and among 3 age groups (P < 0.01). In 4-year age group, the vaccinated rate and the result of immune surveillance were the same. The antibody level and the incidence of measles showed negative correlation.