Bird flu is once again causing a flap in Hong Kong. A woman who recently traveled to mainland China has been diagnosed with the territory's first confirmed case of the disease since 2003, the BBC reports. She has been quarantined in intensive care, and Hong Kong's government has raised its flu response level to “serious." In 1997, an outbreak of H5N1 bird flu killed six people in Hong Kong and prompted authorities to cull every chicken and duck in the territory. (More H5N1 stories.)