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363256

Virulence Studies for Listeria spp. Recovered from Raw Ruminant Milk

Article

Last updated: 23 Dec 2024

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Subjects

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Tags

Bacteriology and bacterial diseases

Abstract

In this study, 512 milk samples (103 raw cow's milk, 100 raw buffaloes milk, 107 raw goats milk, 102 raw ewes milk and 100 raw she-camels milk). The incidence of Listeria among the different ruminant milk species was 6.1%. The isolated Listeria spp. were distributed as 9 isolates from cows, 8 isolates from buffaloes, 6 isolates from goats, 8 isolates from ewes and 4 isolates from she —camels raw milk. The Listeria spp. The Listeria spp. were distributed as 7 isolates of L. monocytogenes, 4 isolates L. innocua, 8 isolates L. welshimeri, 7 strains L. seelegeri and 5 isolates L. grayi in a percentage of 1.4%, 0.8%, 1.6%, 1.4% and 0.98% respectively. The results of virulence study revealed that all of the tested Listeria isolates were strong positive for Congo red after 24 hrs. Virulence of the Listeria isolates was also investigated by detection of hemolysis on blood agar, i/p injection to mice and intraocular distillation in rabbits. Hemolysis on blood agar, death of mice and eye inflammation in rabbits within 24h after injection in an incidence of 100% in case of L. monocytogenes isolates (virulent). On the other hand the suspected isolates of L. innocua, L. seelegeri, L. welshimeri and L. grayi showed negative results (a virulent). 

DOI

10.21608/vmjg.2016.363256

Keywords

Listeria isolation, Virulence, Hemolysis

Authors

First Name

Ahmed

Last Name

Orabi

MiddleName

-

Affiliation

Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, Egypt

Email

-

City

-

Orcid

-

First Name

Kamelia

Last Name

Osman

MiddleName

-

Affiliation

Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, Egypt

Email

-

City

-

Orcid

-

First Name

Ahmed

Last Name

Samir

MiddleName

-

Affiliation

Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, Egypt

Email

ahmed.samir@cu.edu.eg

City

-

Orcid

-

Volume

62

Article Issue

1

Related Issue

47596

Issue Date

2016-01-01

Receive Date

2024-07-02

Publish Date

2016-01-01

Page Start

15

Page End

19

Print ISSN

1110-1423

Online ISSN

2537-1045

Article File

VMJG_Volume 62_Issue 1_Pages 15-19.pdf

PDF . 2.1MB

Link

https://vmjg.journals.ekb.eg/article_363256.html

Detail API

https://vmjg.journals.ekb.eg/service?article_code=363256

Order

363,256

Type

Original Article

Type Code

544

Publication Type

Journal

Publication Title

Veterinary Medical Journal (Giza)

Publication Link

https://vmjg.journals.ekb.eg/

MainTitle

Virulence Studies for Listeria spp. Recovered from Raw Ruminant Milk

Details

Type

Article

Created At

23 Dec 2024