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Importance of wild birds in the spread of Salmonella
Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Infectious Diseases.
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.
Series
Umeå University medical dissertations, 0346-6612 ; N.S., 795
Keyword [en]
Salmonella, wild birds, Black-headed gull, Peregrine falcon, Antarctica, penguins, seals, PFGE, IS200, salmonella carriage
National Category
Infectious Medicine Microbiology in the medical area
Identifiers
URN: urn:nbn:se:umu:diva-94107ISBN: 91-7305-255-8 (print)OAI: oai:DiVA.org:umu-94107DiVA: diva2:764547
Public defence
2002-05-31, Norrlands universitetssjukhus, byggnad 6E, sal E04, Umeå universitet, Umeå, 13:00
Opponent
Supervisors
Projects
digitalisering@umu
Note

Diss. (sammanfattning) Umeå : Umeå universitet, 2002

Available from: 2014-11-19 Created: 2014-10-03 Last updated: 2015-04-09Bibliographically approved
List of papers
1. Enteropathogenic Bacteria in Migrating Birds Arriving in Sweden
Open this publication in new window or tab >>Enteropathogenic Bacteria in Migrating Birds Arriving in Sweden
1997 (English)In: Scandinavian Journal of Infectious Diseases, ISSN 0036-5548, E-ISSN 1651-1980, Vol. 29, no 6, 565-568 p.Article in journal (Refereed) Published
Abstract [en]

Birds have been thought to play a role in transmitting infectious agents like influenza, Borrelia and Salmonella. To investigate the role of migrating birds in the dispersal of enteropathogenic bacteria, stool samples from 151 wild birds (50 gulls and 101 passerines) just entering Sweden from their winter grounds were analysed for Salmonella spp., Campylobacter spp. and EHEC O157:H7. The thermophilic isolated enteropathogens found were further analysed by antibiograms. Among the 50 gulls examined, we found 2 isolates of Salmonella typhimurium with multiple antibiotic resistance. Three isolates of C. jejuni were found in the 101 stool samples from passerines. We did not isolate EHEC O157:H7 in any of the bird stools examined.

Place, publisher, year, edition, pages
Scandinavian University Press, 1997
Keyword
Zoonotisk ekologi, Virologi, Mikrobiologi
National Category
Public Health, Global Health, Social Medicine and Epidemiology Infectious Medicine
Identifiers
urn:nbn:se:umu:diva-96412 (URN)10.3109/00365549709035895 (DOI)
Projects
digitalisering@umu
Available from: 2014-11-19 Created: 2014-11-19 Last updated: 2017-12-05Bibliographically approved
2. Salmonella in migrating birds - myth or reality?
Open this publication in new window or tab >>Salmonella in migrating birds - myth or reality?
Show others...
(English)Manuscript (preprint) (Other academic)
National Category
Infectious Medicine
Identifiers
urn:nbn:se:umu:diva-96417 (URN)
Projects
digitalisering@umu
Available from: 2014-11-19 Created: 2014-11-19 Last updated: 2015-04-08Bibliographically approved
3. Salmonella carriage in European Black headed gulls (Larus ridibundus) in Sweden
Open this publication in new window or tab >>Salmonella carriage in European Black headed gulls (Larus ridibundus) in Sweden
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(English)Manuscript (preprint) (Other academic)
National Category
Infectious Medicine
Identifiers
urn:nbn:se:umu:diva-96422 (URN)
Projects
digitalisering@umu
Note

Submitted 2002

Available from: 2014-11-19 Created: 2014-11-19 Last updated: 2015-04-10Bibliographically approved
4. Salmonella Amager, Campylobacter jejuni, and urease-positive thermophilic Campylobacter found in free-flying peregrine falcons (Falco peregrinus) in Sweden
Open this publication in new window or tab >>Salmonella Amager, Campylobacter jejuni, and urease-positive thermophilic Campylobacter found in free-flying peregrine falcons (Falco peregrinus) in Sweden
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2004 (English)In: Journal of Wildlife Diseases, ISSN 0090-3558, E-ISSN 1943-3700, Vol. 40, no 3, 583-587 p.Article in journal (Refereed) Published
Abstract [en]

Rare species with small population sizes are vulnerable to perturbations such as disease, inbreeding, or random events. The threat arising from microbial pathogens could be large and other species could act as reservoirs for pathogens. We report finding three enteric bacterial species, Salmonella Amager, Campylobacter jejuni, and urease-positive thermophilic Campylobacter, in nestling free-flying peregrine falcons (Falco peregrinus) in Sweden in 2000. Campylobacter jejuni isolates exhibited marked genetic similarities to an isolate from a human, providing a possible association between a human-associated strain of this bacterium and peregrine falcons.

Place, publisher, year, edition, pages
Wildlife Disease Association, 2004
Keyword
Animals, Bird Diseases/*epidemiology/microbiology, Campylobacter/*isolation & purification, Campylobacter Infections/epidemiology/veterinary, Campylobacter jejuni/isolation & purification, Disease Reservoirs/*veterinary, Feces/microbiology, Raptors/*microbiology, Salmonella/*isolation & purification, Salmonella Infections; Animal/epidemiology, Sweden/epidemiology
National Category
Infectious Medicine Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:umu:diva-7345 (URN)10.7589/0090-3558-40.3.583 (DOI)15465731 (PubMedID)
Projects
digitalisering@umu
Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2017-12-14Bibliographically approved
5. Salmonella in sub-Antarctica: low heterogeneity in salmonella serotypes in South Georgian seals and birds
Open this publication in new window or tab >>Salmonella in sub-Antarctica: low heterogeneity in salmonella serotypes in South Georgian seals and birds
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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
Keyword
Zoonotisk ekologi, Virologi, Mikrobiologi
National Category
Infectious Medicine
Identifiers
urn:nbn:se:umu:diva-96424 (URN)
Projects
digitalisering@umu
Note

Published online: 02 January 2001

Available from: 2014-11-19 Created: 2014-11-19 Last updated: 2017-12-05Bibliographically approved

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