RESUMO
Objective To learn the immunity level of Neisseria meningitides (Nm) serogroup W1 35 among healthy population.Methods A total of 410 children aged 0 -14 years were selected by stratified random sampling method in Zhuji city.The polysaccharide antibody IgG level of Nm serogroup W1 35 was detected by ELISA.The antibody concentrations more than 2 μg/mL were identified as positive.Results The geometric mean concentration (GMC)was 1.46 ±0.25 μg/mL and the W1 35 -antibody positive rate was 4.63%.There was no difference on antibody GMC and the W1 35 -antibody postive rate among different region and gender groups.There were statistical differences on antibody GMC among different age groups (P<0.05).The antibody GMT in the age group 15 -34(1.63 ±0.28 μg/mL )was significantly higher than that in other age groups(P <0.05),and the antibody GMT in the age group 1.5 -4 (1.37 ±0.19 μg/mL)was significantly lower than that in the age group 5 -14 (P <0.05).The antibody GMT were significantly lower in the elderly (≥60 years old)than that in the age group <10 and 5 -14(P <0.05).Conclusion The immunity level of Nm serogroup W1 35 among healthy population is low,and it is suggested to be immunized by the vaccines which contained Nm W1 35.