摘要
本研究揭示了柔嫩艾美耳球虫感染可以引起鸡肠炎沙门氏菌感染的复发。复发的主要表现为盲肠内容物的肠炎沙门氏菌阳性率和数量再次显著地升高;肠炎沙门氏菌在盲肠中的滞留时间显著延长。这种复发与肠炎沙门氏菌的初始感染量及球虫感染时间有关。肝脏和脾脏阳性率无显著变化。
Four experiments were conducted to determine the effect of Eimeria tenella infec- tion on the recrudescence of Salmonella enteritidis in previously infected chickens.Significant recrudescence of cecal colonization in the birds challenged with E.tenella was observed at 3wk after S.enteritidis infection in Experiment1,at 3 and 4 wk in Experiment 2,and at 3, 4,and 5wk in Experiments 3 and 4.The recrudescence was indicated by the increase of cecal S.enteritidis counts and by higher S.enteritidis positive rate.The possible prolonged cecal S.enteritidis shedding from chickens infected with coccidia into the environment might be important for the perpetuation of S.enteritidis infectious cycle.Except for Experimentl,in which a significant higher culture-positive rate of the liver was detected in the coccidia-infect- ed group,no significant difference of culture-positive rate of liver and spleen between the treatment was observed.The recrudescence of previous S.enteritidis infection caused by E. tenella infection was obviously related to the initial S.enteritidis dose size and time of expo- sure to coccidia.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1999年第C00期93-97,共5页
Journal of China Agricultural University
基金
本研究得到了日本文部省的部分资助
