INCIDENCE OF LISTERIA SPECIES IN SOME DAIRY PRODUCTS IN BENI-SUEF GOVERNORATE

Saadia Elshinaway ,Mohamed M.a Zeinhom ,A M S Meshref ,Dalia A Hafez

doi:10.21608/avmj.2016.169210

Saadia Elshinaway , Mohamed M.a Zeinhom + Show 2 more

Open Access

https://doi.org/10.21608/avmj.2016.169210

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Abstract

The present study was conducted to investigate the prevalence of Listeria spp . in some dairy products. A total of 240 samples of fresh cream, ice cream, butter milk cheese, Kareish cheese, Talaga cheese and yoghurt (40 of each) were collected randomly from different supermarkets, retail outlets and other markets outlets in Beni-Suef Governorate, Egypt. Out of 240 samples, 24(10%) were positive for Listeria species. The occurrence of Listeria spp . in fresh cream, ice cream, butter milk cheese and Kareish cheese was 6(15%), 8 (20%), 5 (12.5%) and 5(12.5%) respectively, while Listeria species couldn׳t be detected in any of Talaga cheese and yoghurt samples. The most prevalent species was L.grayii (45.83%), followed by L.monocytogenes (33.33%), and L.welshimeri (12.51%) and L. innocua 2(8.33%). All 8 L.monocytogenes isolates showed the presence of the hly A gene suggesting the possibility of danger of food borne listeriosis among dairy products consumers. In conclusion, the results of this study emphasize the need forapplying more strict hygienic control measures especially during processing, storage and marketing of dairy products.

Highlights

Milk and dairy products, because of their nutritional value, are suitable for development of microorganisms including pathogenic bacteria as Listeria species (Kasalica et al, 2011; El Marnissi et al, 2013 and Abd El Tawab et al, 2015).Listeria species are ubiquitous bacteria, well adapted in the environment and can be isolated from soil, vegetables and natural waters as well as from healthy animal and man (Roberts and Weidmann, 2003; Cocolin et al, 2005 and Liu 2008)
Among the species of the genus Listeria, only L. monocytogenes is considered as one of the most significant food borne pathogen that induceserious and potentially life threatening illness known as listeriosis in humans and animals (Ryser and Marth, 2007 and Rahimi et al, 2012)
Many outbreaks of L. monocytogenes infection associated with consumption of milk and dairy products have been reported by CDC (Centers for Disease Control and prevention) (2011) and Gaulin et al (2012)

Summary

Introduction

Listeria species are ubiquitous bacteria, well adapted in the environment and can be isolated from soil, vegetables and natural waters as well as from healthy animal and man (Roberts and Weidmann, 2003; Cocolin et al, 2005 and Liu 2008). In this manner contaminate milk and production plants (Leite et al, 2006). Several outbreaks and sporadic cases of listeriosis primarily associated with consumption of contaminated milk, soft or semi soft cheeses, uncooked and ready to eat foods, unwashed raw vegetables and fruits (Oliver et al, 2005; Swaminathan and Gerner-Smidt, 2007; Rahimi et al, 2010; Kevenk and Gulel, 2016)

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