Effects of different immunization methods on varicella antibody levels in preschool children in Shenzhen City
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摘要:
目的 评价深圳市学龄前儿童水痘抗体水平,为水痘疫苗免疫策略提供科学依据。 方法 采取分层随机抽样的方法,采集深圳市学龄前儿童血样,采用酶联免疫吸附测定(enzyme linked immuno sorbent assay, ELISA)测定血清中水痘抗体滴度,分析接种剂次、接种间隔等不同免疫状态对水痘IgG抗体几何平均浓度(geometric mean concentration, GMC)、抗体阳性率的影响。 结果 深圳市学龄前儿童水痘IgG抗体GMC为11.20 U/mL,阳性率为61.5%。未接种组、接种1次组和接种2次组的GMC分别为4.31 U/mL、12.15 U/mL、15.86 U/mL(F=11.11, P < 0.001),抗体阳性率分别为26.1%、39.5%和74.5%(χ2=41.42, P < 0.001);第1针及时接种组和超期接种组GMC分别为14.17 U/mL、8.07 U/mL(t=3.11, P=0.002),抗体阳性率分别为70.8%、47.9%(χ2=11.12, P < 0.001)。 结论 深圳市学龄前儿童及时地完成第2针疫苗接种可提高免疫抗体水平。 Abstract:Objective To evaluate the level of varicella antibody in preschool children in Shenzhen, and to provide a scientific basis for effective varicella vaccine immunization strategy. Methods Blood samples were collected from preschool children in Shenzhen through stratified random sampling. The varicella antibody titer in the serum was measured using an enzyme-linked immunosorbent assay. The influence of different immunization conditions, such as the number of vaccinations and the interval between vaccinations, on the geometric mean concentration (GMC) and positive rate of varicella IgG antibody was analyzed. Results The GMC of chickenpox IgG antibody in preschool children in Shenzhen was 11.20 U/ml, and the positive rate of chickenpox IgG antibody was 61.5%. The GMC of chickenpox IgG antibody in non-vaccinated group, once vaccinated group and twice vaccinated group were 4.31 U/ml, 12.15 U/ml and 15.86 U/ml, respectively (F=11.11, P < 0.001). And the positive rate of chickenpox IgG antibody was 26.1%, 39.5% and 74.5% in these groups, respectively(χ2= 41.42, P < 0.001); The GMC of chickenpox IgG antibody in the first needle timely vaccination group and extended vaccination group were 14.17 U/ml and 8.07 U/ml, respectively (t=3.11, P=0.002), with positive rate of 70.8% and 47.9%, respectively(χ2=11.12, P < 0.001). Conclusions Timely completion of the second vaccination for preschool children in Shenzhen can improve the antibody levels. -
Key words:
- Varicella /
- Preschool children /
- Immune state /
- Immunization program /
- Strengthen the immune
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表 1 深圳市学龄前儿童水痘IgG抗体水平的总体情况
Table 1. General situation of chickenpox IgG antibody levels in preschool children in Shenzhen City
类别
Category人数
Number ofpeople阳性数
Number ofpositives阳性率/%
Positive rate/%GMC/(U·mL-1) t/χ2/F值value P值
value性别Gender 男Male 149 99 66.4 12.44 1.34 0.182 女Female 142 80 56.3 10.03 2.72 0.099 年龄组/岁Age group/years 4 112 68 60.7 10.78 5 112 69 61.6 11.42 0.07 0.932 6 67 42 62.6 11.54 0.07 0.965 地区District 南山区Nanshan 97 60 61.8 11.33 罗湖区Luohu 95 56 58.9 11.39 0.03 0.969 宝安区Bao′an 99 63 63.6 10.89 0.45 0.796 合计Total 291 179 61.5 11.20 注:GMC, 几何平均浓度。
Note: GMC, geometric mean concentration.表 2 深圳市学龄前儿童水痘疫苗免疫状态分布
Table 2. Distribution of immunization status of varicella vaccine among preschool children in Shenzhen City
类别
Category人数
Number ofpeople阳性数
Number ofpositives阳性率/%
Positive rate/%GMC/(U·mL-1) t/χ2/F值value P值value 接种剂次Number of inoculations 未接种组Non-vaccinated group 23 6 26.1 4.31 接种1次组once vaccinated group 76 30 39.5 12.15 11.11 < 0.001 接种2次组twice vaccinated group 192 143 74.5 15.86 41.42 < 0.001 第1针是否及时接种Get the first dose inoculation in time 是Yes 195 138 70.8 14.17 3.11 0.002 否No 73 35 47.9 8.07 11.12 < 0.001 第2针是否及时接种Get the second dose inoculation in time 是Yes 178 133 74.7 15.47 -0.82 0.426 否No 12 10 71.4 21.86 0.733 2针接种间隔时间/月Interval between two shots/months < 12 15 8 53.3 8.73 12~ < 24 20 12 60.0 13.08 24~ < 36 42 35 83.3 17.65 1.30 0.273 36~ < 48 97 74 76.2 16.73 0.107 ≥48 18 14 77.7 18.89 末次接种后的时间/月Time since last inoculation/months < 12 146 104 71.2 15.23 12~ < 24 45 33 73.3 14.52 24~ < 36 20 9 45.0 6.65 3.77 0.005 36~ < 48 19 8 42.1 6.55 1.33 0.185 ≥48 20 11 55.0 11.00 注:GMC, 几何平均浓度。
Note: GMC, geometric mean concentration. -
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