Abstract:

Objective　Rodent infestations in ports were assessed by comparing the consumption rates of various feed. Methods　The indoor and outdoor rodent activities at all types of institutions of the land, sea and air ports in Yancheng city were studied. The distribution tendency of positive frequencies was plotted based on the feed consumption rates to establish the indicators for rodent infestations. Results　In light of the health quarantine practices, the grading standards for assessment of rodent infestations were established according to the range of the mean positive rate, dispersion and frequency distribution theory relating to rodent activities, as follows: level Ⅰ (hazardless), with the infestation rate of 0-2%; level Ⅱ (mildly hazardous), with the infestation rate of ＞2%-10%; level Ⅲ (moderately hazardous), with the infestation rate of ＞10%-30%; and level Ⅳ (severely hazardous), with the infestation rate of ＞30%. Conclusion　The proposed grading standards for assessment of rodent infestations in ports based on the feed consumption rates may be used separately or in combination with rodent tracing methods for large?scale rodent monitoring in ports.

Key words: Feed consumption rate, Rodent infestation, Feasibility

摘要：

目的　通过鼠类对不同饵料消耗率的比较，对口岸范围鼠类侵害程度进行研究。方法　以盐城“陆、海、空”口岸范围内各类型单位室内外鼠类活动作为研究对象，根据食饵消耗率，分析阳性频度分布趋势，确立鼠类侵害程度指标值。结果　根据鼠征阳性率范围均值、离散度及频度分布理论，考虑卫生检疫实践，提出盐城口岸范围内鼠征法侵害程度分级标准：Ⅰ级（不足为害）侵害率0～2%；Ⅱ级（轻度侵害）侵害率＞2%～10%；Ⅲ级（中度侵害）侵害率＞10%～30%；Ⅳ级（重度侵害）侵害率＞30%。结论　提出用饵料消耗率区分口岸范围鼠类侵害程度分级标准，可与鼠征法同时或单独使用，适合口岸大范围监测要求。

关键词: 饵料消耗率, 鼠类侵害, 可行性