421751

MOLECULAR CHARACTERIZATION AND VIRULENCE GENES PROFILING OF SHIGA TOXIGENIC E. COLI AND BACILLUS CEREUS SENSU LATO ISOLATED FROM RAW MILK AND SOME DAIRY PRODUCTS

Article

Last updated: 27 Apr 2025

Subjects

-

Tags

Milk hygiene & milk product

Abstract

Shiga toxin-producing Escherichia coli (STEC) and Bacillus cereus sensu lato have been recognized as major foodborne pathogens that not only poses a significant risk to human health but also result in economic losses in dairy sectors. Therefore, this study was conducted to assess the presence of STEC and B. cereus s.l. in 90 samples of raw milk, baladi yoghurt and white soft cheese (Tallaga) (30 each) according to biochemical identification and molecular characterization of their virulence and toxigenic genes. The obtained results revealed that STEC was detected in 10% of the baladi yoghurt and 6.6% of Tallaga samples, but in contrast, it was not detected in any of the raw milk samples. Meanwhile, B. cereus s.l. was prevalent in 26.6% of the raw milk and 30% of both baladi yoghurt and Tallaga samples. The molecular characterization of toxigenic genes revealed that 80 % of the identified STEC isolates harboured stx2d, while only 20% carried stx2e; nonetheless, the virulence hlyA and fliCH7 genes were prevalent in 40 & 60% of isolates, respectively.  Noteworthy, stx1, stx2f, stx2, stx2c and eae genes were not detected.  B. cereus s.l. isolates, were found to possess toxigenic genes, such as bceT by 96.1% and both of nhe, and cytK by 76.9%. These findings indicated that raw milk and dairy products may be a potential source of STEC and B. cereus as foodborne pathogens as well as, their virulence and toxigenic genes, necessitating strict hygiene measures, along with periodic authority inspections in Egypt's dairy sector.

DOI

10.21608/avmj.2025.336549.1472

Keywords

cheese, yoghurt, Shiga toxins, E. coli, and Bacillus cereus

Authors

First Name

REEM A.

Last Name

ABOUL EZZ

MiddleName

A

Affiliation

Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.

Email

raboulez70@gmail.com

City

-

Orcid

-

First Name

HAMDY A.

Last Name

ELESAWY

MiddleName

A

Affiliation

Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.

Email

prof.dr.hamdy@gmail.com

City

-

Orcid

-

First Name

SAMAH

Last Name

DARWISH

MiddleName

F

Affiliation

Biotechnology Research Unit, Animal Reproduction Research Institute (ARRI), Agricultural Research Center (ARC), Giza, 12556, Egypt

Email

samah.darwish@arc.sci.eg

City

-

Orcid

-

First Name

EMAN

Last Name

TAHER

MiddleName

M

Affiliation

Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.

Email

eman.elmaghraby@cu.edu.eg

City

-

Orcid

0000-0003-4002-5838

Volume

71

Article Issue

185

Related Issue

55112

Issue Date

2025-04-01

Receive Date

2024-11-14

Publish Date

2025-04-01

Page Start

136

Page End

150

Print ISSN

1012-5973

Online ISSN

2314-5226

Link

https://avmj.journals.ekb.eg/article_421751.html

Detail API

http://journals.ekb.eg?_action=service&article_code=421751

Order

11

Type

Research article

Type Code

1,840

Publication Type

Journal

Publication Title

Assiut Veterinary Medical Journal

Publication Link

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

MainTitle

MOLECULAR CHARACTERIZATION AND VIRULENCE GENES PROFILING OF SHIGA TOXIGENIC E. COLI AND BACILLUS CEREUS SENSU LATO ISOLATED FROM RAW MILK AND SOME DAIRY PRODUCTS

Details

Type

Article

Created At

27 Apr 2025