郑州开封地区鸡卡氏住白细胞原虫病季节动态的研究

Season dynamic state of Leucocytozoon caulleryi infection in chickens in Zhengzhou and Kaifeng regions

本研究从爆发过卡氏住白细胞原虫病的郑州郊区某鸡场每月定期抽样检查10只育成鸡或童鸡,翅下静脉采血涂片,姬-瑞氏染色,每个血片光镜检测100个视野。结果证实,爆发过本病未经有效治疗已无明显症状的鸡的血片中,一年四季不同程度的均可查到病原。本病在郑州地区出现于5～6月份,7～8月份为高峰期,阳性率高达100％,阳性视野达300‰～453‰,以后逐月下降,12、1、2、4月份为低潮期,虽然阳性率为40％～50％,但阳性视野仅为11‰～12‰。调查证实,在郑州地区荒川库蠓是本病的主要传播者。根据郑州地区气温变化分析,荒川库蠓活动的高峰期为5月中旬到6月中、下旬,与发病高峰期基本相符。本病的致死率在1～3月龄鸡为91％,育成鸡为11.8％,老龄鸡较低。本病的发生率各品种鸡间无明显差异。

This paper reported the prevalence of avian leucocytozoonosis in the two areas of Henan p-r ovince from 1934 to 1985. The peak stages of the disease prevalence were in May to June) and in Julyto August of every year. L. caulleryi infection rate was 100%, and the mortalities of one to three months old and growing chickens infected reached 91% and 11.8% respectively. Epidemio-logic analysis suggested the peak stage of Culic-oides arakawai activity basically was correspond to the disease prevalence peak.