Salmonella serovars in laying hen flocks and commercial table eggs from a region of São Paulo state, Brazil

Oc De Freitas Neto,A Berchieri Júnior,Sa Fernandes,P L Campello,Am De Almeida,Vmca Galdino

doi:10.1590/1516-635x160257-62

Oc De Freitas Neto, A Berchieri Júnior + Show 4 more

Open Access

https://doi.org/10.1590/1516-635x160257-62

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Abstract

Salmonella spp. is the main originator of human foodborne diseases worldwide and is mainly transmitted by food containing eggs. In Brazil, as a result of the lack of studies and data collection very little is known about the prevalence of Salmonella spp. in laying hen flocks and commercial table eggs. Consequently the present study was elaborated and aimed at generating data about Salmonella spp. in part of the Brazilian egg production chain. Eight flocks of day-old chicks, eight flocks of adult laying hens (four vaccinated with bacterin against Salmonella Enteritidis and four unvaccinated) and commercial table eggs from four supermarkets were examined. Salmonella spp. was isolated in 50 % of the newly hatched chicks, 25 % of the adult flocks and 1.5 % of egg samples examined. S. enterica subsp. enterica 4,12:r:-, S. Mbandaka, S. enterica subsp. enterica 6,7: z10:-, S. Enteritidis and S. Havana were the serovars isolated in birds. In commercial table-eggs S. Mbandaka, S. enterica subsp. enterica 6,7: z10:- and S. Braenderup were isolated. These results show that Salmonella spp. is present in laying hen flocks and consequently in eggs destined for human consumption. Probably, some of the Salmonella serovars are being introduced in egg farms by vertical via.

Highlights

Samonella spp. is a major zoonotic pathogen being the originator of several foodborne diseases outbreaks worldwide each year
This study aimed at surveying for Salmonella serovars in flocks of newly hatched chicks, adult commercial laying hens and a representative amount of commercial table-eggs from supermarkets of a region of Sao Paulo state, Brazil
Mbandaka was isolated in flocks of farms B, C, F and G; Salmonella enterica subspecies. enterica 4,12: r: - was recovered in flock from farm C and Salmonella enterica subsp. 6,7 enterica: Z10: - on farm G (Table1)

Summary

Introduction

Samonella spp. is a major zoonotic pathogen being the originator of several foodborne diseases outbreaks worldwide each year. These microorganisms may cause human suffering as well as economic losses to food production and to the food industry (Foley et al, 2008; IFAH, 2012). There are over 2,600 Salmonella serovars identified but about 90 are responsible for human and animal salmonellosis (EFSA, 2009, CDC, 2011). Food of animal origin is the main source of Salmonella spp. for human beings (Pires et al, 2010). There has been an increase in reported cases of human salmonellosis, making the public health authorities focus attention on controlling Salmonella spp. in livestock, poultry, and their products (Newell et al, 2010)

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