A woman working as a judge at a dog show event has been badly injured after falling from the judges' box.

The 35-year-old, of Te Awamutu, suffered serious head and chest injuries when she fell down the stairs this afternoon.

The Waikato Westpac Rescue Helicopter was called to a farm just south of of Ohura, near Taumarunui, about 3.30pm.

A dog trial event was happening at the time and the woman had been one of the judging panel.

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She was airlifted to Waikato Hospital for treatment.