Surveillance and analysis of avian influenza viruses in wild birds in Australia

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Birds are commonly infected with bird flu viruses but most of these viruses do not cause disease. However, certain types of bird flu viruses, such as the H5N1 strain, can cause severe illness and death in 100% of infected birds. There is currently an epidemic of H5N1 bird flu occurring in Asia. Occasionally humans become infected by bird to human transmission and since 2003, 130+ people have been infected with H5N1 resulting in 60+ deaths. There are 3 ways in which dangerous strains of the virus may be brought to Australia by; infected people, domestic birds and migratory wading birds. In order to monitor the import of these viruses by migratory birds we will catch and take samples from large numbers of these birds in important areas where they congregate close to humans and poultry farms. We will identify what types of bird flu viruses these birds are carrying and if the viruses are capable of causing disease in birds and humans. We will also see if they can be treated by the influenza drugs that we currently have and we will study these viruses to find new drug targets. These viruses are commonest in ducks. Migratory wading birds and local ducks live in the same habitats so there is the chance that the wading birds and ducks could pass the viruses to each other. There is an additional concern that non-disease causing viruses could mutate in ducks and become pathogenic and pass from bird to bird or even human to human transmission which could cause a major human epidemic of bird flu in Australia. So we will also take samples from local ducks that occur in the same areas as the wading birds and test them for viruses as well. Our results will show what kinds of viruses are being carried by wading birds and ducks and if these viruses are a danger to people and poultry. We can then manage important areas so that humans and poultry do not come into contact with these viruses.