Beta
175005

ASSOCIATED PROFILES OF VIRULENCE GENE MARKERS IN CLOSTRIDIUM PERFRINGENS STRAINS ISOLATED FROM HEALTHY AND DISEASED BROILER CHICKENS WITH NECROTIC ENTERITIS

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Last updated: 23 Jan 2023

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Abstract

Clostridium perfringens induced necrotic enteritis (NE) and subclinical disease have become important threats to poultry health and is one of the main causes of losses in broiler flocks due to high mortalities and reduction in growth rate as well as enterotoxemias in domestic animals and humans . The mechanism of virulence of C. perfringens, a bacterium causing necrotic enteritis in birds, results largely from its ability to produce toxins. A study was set up to look the rate of carriage of C. perfringens among broilers with different heath status, incidence rate of the different toxin genotypes of C. perfringens in healthy and diseased birds and, lastly, the relative abundance of cpe, cpb2 and netB virulence genes. Broiler chickens from healthy flocks were sampled by cloacal swabs, while intestinal and liver samples of birds suffering from necrotic enteritis were analysed. A total of 47 (83.9%) isolates was obtained from 56 examined pooled samples (n=4) of broiler chickens with clinical problems and 14 (51.85%) isolates were obtained from 27 pooled samples (n=4) from broiler chickens without clinical problems. Seroneutralization with mice or guinea pigs has been used to type each toxin, but this conventional method has some disadvantages. Therefore, we used a multiplex PCR (m-PCR) assay with primers amplifying fragments of alpha (cpa), beta (cpb), epsilon (etx), iota (iap < /em>), for genotyping of isolated C. perfringens strains. All 61 broiler chicken     C. perfringens isolates were shown to carry the cpa gene but not cpb, etx and iA genes, signifying that all isolates represented type A. For the first time the associated profiles of the following virulence genes [ cpe, cpb2 (beta-2 toxin) and the newly described pore forming toxin gene (netB)] were determined among Egyptian isolated C. perfringens strains. None of the isolates contained the enterotoxin gene that may indicate the enterotoxin of C. perfringens does not play important role in the occurrence of Necrotic enteritis in broiler chickens. netB was almost always found in outbreak isolates, suggesting a positive correlation of netB toxin gene with the diseased status that may explain its role in the pathogenesis of the disease. Whereas cpb2 was found in healthy and diseased bird isolates that suggest there is a weak or no relationship between beta2 toxin and necrotic enteritis in birds. So this study throw novel insights into the presence and distribution of C. perfringens types as well as virulence-associated genes in field strains, which will help us to understand the pathogenesis of disease in poultry and more comprehensively characterize C. perfringens in future studies to put a suitable strategy for prevention and control.

DOI

10.21608/avmj.2009.175005

Keywords

Key words: Clostridium perferingens, Broiler chickens, virulence and m-PCR

Authors

First Name

M.A.

Last Name

MOHAMED

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Affiliation

Dept. of Poultry Diseases, Faculty of Vet. Med., Assiut Univ., Assiut-Egypt

Email

moemenassiut@hotmail.com

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Orcid

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First Name

SYLVIA

Last Name

O. AHMED

MiddleName

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Affiliation

Dept. Animal Hygiene and Zoonosis, Fac.of Vet. Med., Assiut University, Assiut, Egypt.

Email

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Orcid

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First Name

T.Y.

Last Name

ABDEL MOTELIB

MiddleName

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Affiliation

Dept. of Poultry Diseases, Faculty of Vet. Med., Assiut Univ., Assiut-Egypt

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Volume

55

Article Issue

123

Related Issue

24381

Issue Date

2009-10-01

Receive Date

2009-09-12

Publish Date

2009-10-03

Page Start

1

Page End

18

Print ISSN

1012-5973

Online ISSN

2314-5226

Link

https://avmj.journals.ekb.eg/article_175005.html

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https://avmj.journals.ekb.eg/service?article_code=175005

Order

22

Type

Research article

Type Code

1,840

Publication Type

Journal

Publication Title

Assiut Veterinary Medical Journal

Publication Link

https://avmj.journals.ekb.eg/

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Article

Created At

23 Jan 2023