Indonesian children play with a chicken in Kedaung village, outside Jakarta, Indonesia, June 3, 2006

Doctors in Indonesia have reported the country's 37th confirmed death from bird flu - a 15-year-old boy from the West Java capital of Bandung.

Doctors said the boy died May 30, but test results only recently confirmed the H5N1 infection.

Indonesia has reported a spike in bird flu cases in recent months. Officials are examining 54 people who were quarantined because of ties to a family decimated by the virus.

The deaths of the seven members of a single family raised concerns that the virus was being transmitted from human to human, which health officials worry could rapidly spread the disease.

World Health Organization officials called the case the most significant development yet in the spread of the virus.