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Molecular epidemiology of Salmonella enteritidis phage type 1b and 6a isolates in Portugal. 2003

A R Soares, and J Machado
Enterobactereaceae Unity, Bacteriology Center, National Institute of Health Dr. Ricardo Jorge, Lisbon, Portugal.

Salmonella enterica serotype Enteritidis is an important serovar comprising 76 % of Salmonella isolates in Portugal in 2001. For better understand the epidemiology of salmonellosis, a total of 47 isolates of S. Enteritidis phage type (PT) 1b and 6a were analysed by pulsed-field gel electrophoresis (PFGE) and genomic DNA was subjected to macro restriction with XbaI. For PT 1b isolates, only three different patterns were observed, and PT6a showed a total of 10 digestion patterns. Curiously, the main pattern among PT1b isolates seams quite similar to main pattern of PT6a isolates, but when the two patterns were analysed with Bionumerics, we observed that they exhibited some differences. It was concluded that, in 2001, there was one predominant pattern for PT1b and PT6a and, possibly, we were in presence of clonal strains that exists all over the country.

UI MeSH Term Description Entries
D011174 Portugal A country in southwestern Europe, bordering the North Atlantic Ocean, west of Spain. The capital is Lisbon. Madeira Island,Portuguese Republic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001434 Bacteriophage Typing A technique of bacterial typing which differentiates between bacteria or strains of bacteria by their susceptibility to one or more bacteriophages. Phage Typing,Typing, Bacteriophage,Typing, Phage
D012477 Salmonella enteritidis A serotype of Salmonella enterica which is an etiologic agent of gastroenteritis in man and other animals. Salmonella enterica serovar enteritidis
D012480 Salmonella Infections Infections with bacteria of the genus SALMONELLA. Salmonellosis,Infections, Salmonella,Infection, Salmonella,Salmonella Infection,Salmonelloses
D016036 Seroepidemiologic Studies EPIDEMIOLOGIC STUDIES based on the detection through serological testing of characteristic change in the serum level of specific ANTIBODIES. Latent subclinical infections and carrier states can thus be detected in addition to clinically overt cases. Seroprevalence,Seroepidemiologic Study,Seroepidemiological Study,Studies, Seroepidemiologic,Study, Seroepidemiologic,Seroepidemiological Studies,Seroprevalences,Studies, Seroepidemiological,Study, Seroepidemiological
D016521 Electrophoresis, Gel, Pulsed-Field Gel electrophoresis in which the direction of the electric field is changed periodically. This technique is similar to other electrophoretic methods normally used to separate double-stranded DNA molecules ranging in size up to tens of thousands of base-pairs. However, by alternating the electric field direction one is able to separate DNA molecules up to several million base-pairs in length. Electrophoresis, Gel, Pulsed-Field Gradient,Gel Electrophoresis, Pulsed-Field,Contour-Clamped Homogeneous-Field Gel Electrophoresis,Electrophoresis, Gel, Pulsed Field,Electrophoresis, Pulsed Field Gel,Field Inversion Gel Electrophoresis,Orthogonal Field Alternation Gel Electrophoresis,Orthogonal-Field Alternation-Gel Electrophoresis,Pulsed Field Gradient Gel Electrophoresis,Pulsed-Field Gel Electrophoresis,Pulsed-Field Gradient Gel Electrophoresis,Alternation-Gel Electrophoresis, Orthogonal-Field,Contour Clamped Homogeneous Field Gel Electrophoresis,Electrophoresis, Orthogonal-Field Alternation-Gel,Electrophoresis, Pulsed-Field Gel,Gel Electrophoresis, Pulsed Field,Pulsed Field Gel Electrophoresis
D017720 Molecular Epidemiology The application of molecular biology to the answering of epidemiological questions. The examination of patterns of changes in DNA to implicate particular carcinogens and the use of molecular markers to predict which individuals are at highest risk for a disease are common examples. Epidemiology, Molecular,Genetic Epidemiology,Epidemiologies, Genetic,Epidemiologies, Molecular,Epidemiology, Genetic,Genetic Epidemiologies,Molecular Epidemiologies

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