A woman in Hong Kong is seriously ill in hospital with bird flu – the first human case of the disease to be diagnosed in the territory since 2003. Officials said the 59-year-old fell ill shortly after returning from a visit to the Chinese mainland. It is not yet clear whether she contracted the potentially fatal disease there or in Hong Kong. The territory has raised its alert level to “serious”, meaning there is a risk of contracting the disease. The last outbreak of the H5N1 bird flu virus in Hong Kong killed six people in 2003, BBC reported.