Quick Guide: Bird flu
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Global threat

Evolving menace

Virus origins

Human dimension

Fighting the virus

Fighting the virus
The 1918 flu pandemic killed more people than WWI

There is currently no effective vaccine to protect humans against H5N1, although one is being developed.

Once a pandemic virus emerges, it would take at least three months to start work on a vaccine.

No-one knows what form the mutated virus would take.

However, some anti-viral drugs can help limit symptoms and reduce the chances of the disease spreading.

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