title: Who Is Spreading Avian Influenza in the Moving Duck Flock Farming Network of Indonesia?
abstract: Duck populations are considered to be a reservoir of Highly pathogenic avian influenza (HPAI) virus H5N1 in some agricultural production systems, as they are able to shed the virus for several days without clinical signs. Countries endemically affected with HPAI in Asia are characterised by production systems where ducks are fed on post-harvest spilled rice. During this scavenging process it is common for ducks to come into contact with other duck flocks or wild birds, thereby providing opportunities for virus spread. Effective risk management for HPAI has been significantly compromised by a limited understanding of management of moving duck flocks in these countries, despite of a small number of recent investigations. Here, for the first time, we described the management of moving duck flocks and the structure of the moving duck flock network in quantitative terms so that factors influencing the risk of HPAIV transmission can be identified. By following moving duck flock farmers over a period of 6 months in Java, Indonesia, we were able to describe the movement of flocks and to characterise the network of various types of actors associated with the production system. We used these data to estimate the basic reproductive number for HPAI virus spread. Our results suggest that focussing HPAI prevention measures on duck flocks alone will not be sufficient. Instead, the role of transporters of moving duck flocks, hatcheries and rice paddy owners, in the spread of the HPAI virus needs to be recognised.
authors.affiliation: School of Veterinary Science, University of Queensland, Gatton, Queensland, Australia.
authors.forename: Joerg
authors.initials: J
authors.lastname: Henning
authors.affiliation: Royal Veterinary College, University of London, London, United Kingdom.
authors.forename: Dirk U
authors.initials: DU
authors.lastname: Pfeiffer
authors.affiliation: Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville Victoria, Australia.
authors.forename: Mark
authors.initials: M
authors.lastname: Stevenson
authors.affiliation: Disease Investigation Centre, Wates, Indonesia.
authors.forename: Didik
authors.initials: D
authors.lastname: Yulianto
authors.affiliation: Disease Investigation Centre, Wates, Indonesia.
authors.forename: Walujo
authors.initials: W
authors.lastname: Priyono
authors.affiliation: School of Veterinary Science, University of Queensland, Gatton, Queensland, Australia.
authors.forename: Joanne
authors.initials: J
authors.lastname: Meers
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D004196:Disease Outbreaks / Q000662:veterinary; D004372:Ducks / Q000821:virology*; D040362:Geographic Information Systems; D007214:Indonesia / Q000453:epidemiology; D053124:Influenza A Virus, H5N1 Subtype / Q000276:immunology / Q000302:isolation & purification; D005585:Influenza in Birds / Q000453:epidemiology / Q000635:transmission / Q000821:virology*; D011201:Poultry Diseases / Q000453:epidemiology / Q000635:transmission / Q000821:virology*
chemical_list: D000914:Antibodies, Viral