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Salmonella in sub-Antarctica: low heterogeneity in salmonella serotypes in South Georgian seals and birds
Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Infectious Diseases.
British Antarctic SurŠey, National EnŠironment Research Council, Cambridge, UK.
Department of Bacteriology, National Veterinary Institute, Uppsala, Sweden.
Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Infectious Diseases. Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Clinical Bacteriology.
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2000 (English)In: Epidemiology and Infection, ISSN 0950-2688, E-ISSN 1469-4409, Vol. 125, no 2, 257-262 p.Article in journal (Refereed) Published
Abstract [en]

The number of human visitors to Antarctica is increasing rapidly, and with it a risk of introducing infectious organisms to native animals. To study the occurrence of salmonella serotypes in sub- Antarctic wildlife, faecal samples were collected from gentoo penguins, macaroni penguins, gray-headed albatrosses, black-browed albatrosses and Antarctic fur seals on Bird Island in the South Georgian archipelago during the austral summer of 1996 and 1998. In 1996, S. havana, S. typhimurium and S. enteritidis were isolated from 7% of gentoo penguins and 4% of fur seals. In 1998, however, 22% of fur seals were found to be infected with S. havana, S. enteritidis and S. newport. All isolates, except one, showed identical pulsed-field gel electrophoresis-patterns within each serotype, irrespective of sampling year and animal reservoir. No significant antibiotic resistance was found. The very low heterogeneity in the salmonella isolates found could either indicate a high genetic adaptation of the bacteria to the environment or a recent introduction of salmonella into the area.

Place, publisher, year, edition, pages
Cambridge University Press, 2000. Vol. 125, no 2, 257-262 p.
Keyword [sv]
Zoonotisk ekologi, Virologi, Mikrobiologi
National Category
Infectious Medicine
URN: urn:nbn:se:umu:diva-96424OAI: diva2:764599

Published online: 02 January 2001

Available from: 2014-11-19 Created: 2014-11-19 Last updated: 2015-04-10Bibliographically approved
In thesis
1. Importance of wild birds in the spread of Salmonella
Open this publication in new window or tab >>Importance of wild birds in the spread of Salmonella
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Salmonella is one of the most important enteropathogenic bacteria. It is responsible for about 5000 reported cases of human gastroenteritis each year in Sweden. Salmonellosis is a zoonotic disease, and the bacterium has the ability to infect a variety of both domestic and wild animal species.

In studies of Swedish wild bird populations, we found that Black-headed gull may be the main reservoir for Salmonella in birds, and that Salmonella infection is expressed as carriage with no obvious disease manifestations. Black-headed gull is a migratory bird and can transport strains of Salmonella with virulence traits like antibiotic resistance, from sources outside Sweden. Genetic molecular methods, PFGE and IS200, also demonstrate that Black-headed gull play a role in the transmission chain of Salmonella in Sweden.

In a study of the Swedish Peregrine Falcon population, Salmonella amager and Campylobacter jejuni were found. There were indications, based on serotyping of Salmonella and genetical typing by PFGE of Campylobacter that these isolates were transmitsted to the falcons from a human or domestic animal source. This bird of prey has sparse contact with humans but may be infected by Salmonella of human origin by feeding on other birds, like gull.

Salmonella was found in penguins, albatrosses and mainly in seals in a study in Antarctica. Several features of the Salmonella serotypes found indicate a human source for Salmonella infection in these animals, and also a spread of Salmonella within and between animal species in Antarctica.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2002. 61 p.
, Umeå University medical dissertations, 0346-6612 ; N.S., 795
Salmonella, wild birds, Black-headed gull, Peregrine falcon, Antarctica, penguins, seals, PFGE, IS200, salmonella carriage
National Category
Infectious Medicine Microbiology in the medical area
urn:nbn:se:umu:diva-94107 (URN)91-7305-255-8 (ISBN)
Public defence
2002-05-31, Norrlands universitetssjukhus, byggnad 6E, sal E04, Umeå universitet, Umeå, 13:00

Diss. (sammanfattning) Umeå : Umeå universitet, 2002

Available from: 2014-11-19 Created: 2014-10-03 Last updated: 2015-04-09Bibliographically approved

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Palmgren, HelenaBroman, TinaSellin, MatsBergström, SvenOlsen, Björn
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