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A chart showing how a flu strain can jump from animals to humansA steadily rising number of New Zealanders are dying from swine flu as the pandemic of the new virus sweeps the world.

The World Health Organisation describes it as the fastest-moving pandemic the world's seen.

Although at present the virus is considered to cause mild to moderate illness, there are fears it could mutate in to a much more dangerous infection.

New Zealand was one of the first countries to face swine flu, and at the most dangerous time --in winter.

It's led to one of the largest health responses this country's ever attempted.

Health Correspondent, Karen Brown, asks what lessons are being learnt.