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Experimental induction of necrotic enteritis with or without predisposing factors using netB positive Clostridium perfringens strains

文献类型： 外文期刊

作者： Mohiuddin, Mudassar 1 ; Yuan, Weikang 1 ; Song, Zhongfeng 1 ; Liao, Shenquan 1 ; Qi, Nanshan 1 ; Li, Juan 1 ; Lv, Minn 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Guangdong Lab Lingnan Modern Agr Sci Observat & E, Key Lab Livestock Dis Prevent Guangdong Prov, Inst Anim Hlth,Maoming Branch,Minist Agr, Guangzhou 510640, Peoples R China

2.Islamia Univ Bahawalpur, Fac Vet & Anim Sci, Dept Microbiol, Bahawalpur 63100, Pakistan

关键词： Necrotic enteritis; C; perfringens; Eimeria necatrix; Fish meal; Intestinal lesions

期刊名称：GUT PATHOGENS （ 影响因子：4.181； 五年影响因子：4.524 ）

ISSN： 1757-4749

年卷期： 2021 年 13 卷 1 期

页码：

收录情况： SCI

摘要： Background Poultry necrotic enteritis (NE) is an economically important disease caused by C. perfringens. The disease causing ability of this bacterium is linked with the production of a wide variety of toxins. Among them, necrotic enteritis B-like (NetB) toxin is reported to be involved in the pathogenesis of NE; in addition there is some circumstantial evidence that tpeL toxin may enhance virulence, but this is yet to be definitely shown. The situation becomes more complicated in the presence of a number of predisposing factors like co-infection with coccidia, type of diet and use of high protein diet. These co-factors alter the intestinal environment, thereby favoring the production of more toxins, leading to a more severe disease. The objective of this study was to develop a successful animal model that would induce clinical signs and lesions of NE using C. perfringens type G strains obtained from field outbreaks. A separate trial was simultaneously considered to establish the role of dietary factor with coccidial co-infection in NE. Results The results have shown that use of net-B positive C. perfringens without predisposing factors induce moderate to severe NE (Av. Lesion score 1.79 +/- 1.50). In a separate trial, addition of fish meal to a feed of C. perfringens challenged birds produced higher number of NE cases (Av. Lesion score 2.17 +/- 1.28). However, use of less virulent E. necatrix strain along with fish meal in conjunction with net-B positive strain did not alter the severity of NE lesions in specific pathogen free chicken (Av. Lesion score 2.21 +/- 1.13). Conclusions This study suggests that virulent C. perfringens type G strains can induce NE lesions in the absence of other predisposing factors. Birds in the clostridia challenged group showed moderate to severe NE lesions. Use of less virulent coccidia strain contributed to a lesser extent in increasing the severity of disease. Maize based diet along with fishmeal (1:1) increased the severity of lesions but statistically it was non-significant. The NE lesions in all experimental groups were found to be present more frequently in the duodenum. In this way, this study provided an effective model for in vivo production of NE in poultry birds.

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