Surveillance on Immune Antibody Levels Against Correlated Diseases Among Floating Children of Brick Kiln Factories in Nantong in 2008

Objective To evaluate the vaccination efficacy and immunity among the floating children of brick kiln factories in Nantong City,and to provide the evidence for the floating children's immunization and prevention programme in Nantong City. Methods Using stratified cluster random sampling method,serum samples were collected from floating children of brick kiln factories in 7 counties of Nantong City to detect immune antibody levels,and the results were statistically analyzed. Results The results showed that the positive rate of hepatitis B was 61.90%. The positive rates of poliomyelitisⅠ,Ⅱ,Ⅲ,diphtheria,tetanus,measles,epidemic encephalitis serogroup A antibody,encephalitis B vaccines were 92.82%,95.03%,86.74%,75.48%,79.67%,72.05%,52.97% and 84.64% respectively,and the GMTs were 1:202.23,1:233.79,1:76.70,1:60.23,1:58.96,1:32.00,1:16.00 and 1:11.88 respectively. Conclusions The results of this survey suggest that the antibody levels are uneven among the floating children of brick kiln factories,the positive rates of poliomyelitisⅠ,Ⅱ,Ⅲ and encephalitis B vaccines are higher and basically attain the criteria of vaccination standard promulgated by the Ministry of Health. But the positive rates of hepatitis B,diphtheria,tetanus,measles,and epidemic encephalitis serogroup A antibody are lower which indicate that the immune barriers are not solid,therefore,standardized management of vaccination should be further strengthened among the floating children.