The investigation for ND antibody during March 2007-May 2008 in the center of Shandong Province showed that the antibody levels exceeded the normal immune levels and had a big discrete degree in many flocks, which were suspected of being infected by NDV. The proportions of infected flocks were 12.3% in AA broilers and spotted chickens, 21.5% in breeding hens, respectively, while it was as high as 51.2% in layers. The results of HI test were verified by virus isolation and indirect fluorescent antibody test. The investigation showed that many poultry were infected by NDV though they did not show identical ND symptom. The biggest problem of controlling ND in China was poultry carrying NDV in high proportion.%对2007年3月～2008年5月泰安及周边地区鸡群新城疫抗体水平检测结果进行了统计分析,统计结果显示:抗体效价超过正常免疫水平且离散度较大,疑似新城疫野毒感染的鸡群较多.其中肉仔鸡(或麻鸡)群、育成蛋鸡群分别为12.3%、21.5%,而产蛋鸡群高达51.2%.采用接种鸡胚分离病毒和间接免疫荧光试验验证HI试验检测结果的判定,探讨鸡群的带毒状况.调查结果表明,目前鲁中地区各种鸡群的新城疫感染带毒状况较为严重,高比例带毒鸡群的存在是我国控制新城疫的最大难题.
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