Quick Guide: Bird flu
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Global threat

Evolving menace

Virus origins

Human dimension

Fighting the virus

Virus origins
Handling infected chicken poses a danger to humans

Bird-flu viruses occur naturally in migratory waterfowl, which tend not to develop symptoms.

But the virus can be passed to domestic birds, which are far more susceptible.

Once the virus is found in commercial or household flocks, rapid destruction is recommended of all birds that might be infected and farms quarantined.

Millions of birds have been killed in an effort to contain the latest outbreak and minimise risk to humans.