It appears that seven people in Vietnam have tested positive for the H5N1 bird flu after having initially testing negative. A scientist for the World Health Organization in Vietnam urges that government officials 'make sure quality control is good.'

The tests in question were originally conducted in Vietnam and then sent to Japan where they were retested and the virus discovered. So far, 46 people in Vietnam, Thailand and Cambodia have died since December 2003.

Bird flu was first identified in humans in 1997, and these cases were transmitted from birds. Health officials fear that the virus will mutate, and human to human transmission will become more widespread causing a pandemic, which could kill millions of people worldwide.

News of the misdiagnosis is particularly troubling in light of recent discovery of a Vietnamese health care worker who seems to have contracted the disease from a patient.