title: Commercially laid eggs vs. discarded hatching eggs: contamination by Salmonella spp.
abstract: Salmonella enterica is frequently associated with outbreaks of human salmonellosis, and products of avian origin, such as eggs and chicken meat, are the main vehicles of its transmission. The present study describes the occurrence of different serovars of Salmonella enterica and phagotypes of S. enterica serovar Enteritidis in eggs destined for human consumption. Four thousand eggs obtained from commercial egg laying farms and one thousand discarded hatching eggs from broiler farms, which were acquired at farmers' markets and informal shops, were analyzed. Salmonella spp. was isolated from 52.0% of the discarded hatching eggs, in which the predominant serovar was Enteritidis (84.6%), and the predominant Salmonella Enteritidis phagotype (PT) was PT7 (26.9%). Salmonella spp. was not isolated from eggs obtained from commercial egg laying farms. The antimicrobial resistance profile showed that 23.1% (n = 6) of the SE strains were resistant to nalidixic acid. The results suggest that the consumption of discarded hatching eggs represents an important source of Salmonella transmission to humans.
authors.affiliation: Departamento de Ciência e Tecnologia de Alimentos, Centro de Ciências Agrárias, Universidade Estadual de Londrina, PR, Brazil.
authors.forename: Luciana B M
authors.initials: LB
authors.lastname: Kottwitz
authors.forename: Joice Aparecida
authors.initials: JA
authors.lastname: Leão
authors.forename: Alberto
authors.initials: A
authors.lastname: Back
authors.forename: Dalia dos P
authors.initials: Ddos P
authors.lastname: Rodrigues
authors.forename: Marciane
authors.initials: M
authors.lastname: Magnani
authors.forename: Tereza C R M
authors.initials: TC
authors.lastname: de Oliveira
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002645:Chickens; D024881:Drug Resistance, Bacterial; D004531:Eggs / Q000382:microbiology*; D006801:Humans; D015995:Prevalence; D012475:Salmonella / Q000145:classification* / Q000187:drug effects / Q000302:isolation & purification*; D065288:Serogroup
chemical_list: D000900:Anti-Bacterial Agents
keywords: Salmonella Enteritidis; antimicrobial resistance; discarded eggs; salmonellosis