Yunnan provincial health authorities announced yesterday that an American living in Kunming has been quarantined at home after flying on the same Northwest Airlines flight between Tokyo and Beijing as China's first confirmed H1N1 virus case, a 30-year-old man who flew on to Chengdu, where he is under quarantine.

The quarantined American citizen's name, gender and age have not been revealed, nor have any symptoms of H1N1 – commonly known as swine flu – been detected by the special team of epidemiologists that has been dispatched to the quarantined individual's Kunming residence.

The only information provided at this point is that the individual in question works for an NGO in Kunming.

In related news, it has also being reported that six Yunnanese are under quarantine in Chengdu after flying the same Sichuan Airlines flight from Beijing to Chengdu as the man who tested positive for the H1N1 virus.