Human migration is important in the international spread of exoticSalmonellaserovars in animal and human populations

Author:

IVESON J. B.,BRADSHAW S. D.,HOW R. A.,SMITH D. W.

Abstract

SUMMARYThe exposure of indigenous humans and native fauna in Australia and the Wallacea zoogeographical region of Indonesia to exoticSalmonellaserovars commenced during the colonial period and has accelerated with urbanization and international travel. In this study, the distribution and prevalence of exoticSalmonellaserovars are mapped to assess the extent to which introduced infections are invading native wildlife in areas of high natural biodiversity under threat from expanding human activity. The major exoticSalmonellaserovars, Bovismorbificans, Derby, Javiana, Newport, Panama, Saintpaul and Typhimurium, isolated from wildlife on populated coastal islands in southern temperate areas of Western Australia, were mostly absent from reptiles and native mammals in less populated tropical areas of the state. They were also not recorded on the uninhabited Mitchell Plateau or islands of the Bonaparte Archipelago, adjacent to south-eastern Indonesia. Exotic serovars were, however, isolated in wildlife on 14/17 islands sampled in the Wallacea region of Indonesia and several islands off the west coast of Perth. Increases in international tourism, involving islands such as Bali, have resulted in the isolation of a high proportion of exotic serovar infections suggesting that densely populated island resorts in the Asian region are acting as staging posts for the interchange ofSalmonellainfections between tropical and temperate regions.

Publisher

Cambridge University Press (CUP)

Subject

Infectious Diseases,Epidemiology

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