美国青少年人群中的婴儿出生率在经历十四年的持续下降之后开始上升。
The birth rate among teens overall in the United States is rising after 14 years of decline.
结论岳阳市健康青少年人群的抗白喉抗体水平较高，能够有效防止白喉流行。
Conclusion The level of antibodies against Bacilius diphtheriae in teen-age people in our city is high enough to prevent diphtheria epidemic outbreak.
目的调查河南省青少年人群非结核分枝杆菌的感染情况、变化趋势及影响因素。
Objective To investigate the NTB infection rate among adolescent and its changing tendency in Henan.
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