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赤峰地区于1948～1996年发现了16632．2km2鼠疫自然疫源地，分布于11个旗（县、区）。目前达到控制鼠疫面积13917．8km2，占疫源地总面积的83．68％。选取与疫源地相关的12种量化因子进行聚类分析，结果可分为四类：1．疫源性长存区；2．动物鼠疫间断流行区；3．鼠疫动物病控制区；4．疫源性基本消除区。同时对防制措施进行了探讨。
Chifeng area in 1948 ~ 1996 found 16632.2km2 plague natural foci, distributed in 11 flags (counties, districts). At present, it has reached 13917.8 km 2 of plague control area, accounting for 83.68% of the total area of the epidemic area. The 12 quantitative factors related to the foci were selected for cluster analysis. The results can be divided into four categories: 1. Foci of endemic areas; 2. Animal plague epidemic area; 3. Plague animal disease control area; 4. Fungi basic elimination zone. At the same time, the preventive measures were discussed.