Key points from article :
68-year-old woman from eastern China developed symptoms on 25 December.
Admitted to hospital but has since fully recovered.
Confirmed as the first ever human case of H7N4 bird flu.
She had contact with live poultry before the onset of symptoms.
There are nine known subtypes of H7 viruses.
Hong Kong advises avoiding wet markets, live poultry markets and farms.
