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Distribution and Genetic Variability Among Campylobacter Spp. in Switzerland
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Campylobacter infections in humans have become more important than Salmonella infections. In Switzerland, a national database with 1028 Campylobacter isolates from poultry, pigs, cats, dogs, cattle, humans, zoo animals and water has been created. The database contains the genetic fingerprint and background information of each Campylobacter isolate. Very informative!
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Dominant species could be identified in the different sources with a majority of Campylobacter jejuni in poultry (73%), humans (79%), cattle (95%), zoo animals (40%) and water (100%), of Campylobacter coli in pigs (72%), and of Campylobacter upsaliensis/helveticus in cats and dogs (55%).
The comparison of three genotyping methods, amplified fragment length polymorphism (AFLP), pulsed field gel electrophoresis and restriction fragment length polymorphism, revealed that AFLP allows discrimination between the different Campylobacter species and is the most appropriate method to distinguish specific strains within the same species.
Genotyping analysis demonstrated that the Campylobacter population is heterogeneous among the different sources and that no dominant clone is spread in the country. Genotyping and the resulting database are useful tools to trace back future Campylobacter infections.
Source: J. Keller, B. Wieland, M. Wittwer, R. Stephan, V. Perreten (2007): Distribution and Genetic Variability Among Campylobacter spp. Isolates from Different Animal Species and Humans in Switzerland. In: Zoonoses and Public Health 54 (1), 27.
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Pasteurella multocida diversity in poultry and pigs in Australia
This recently published study investigates the genotype and diversity of Pasteurella multocida present in pig herds and determines the extent of overlap with isolates from poultry flocks in Australia. Do the isolates vary? A very interesting study not only for Australia.
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