Health authorities in Turkey have reversed an earlier diagnosis in the death of a 14-year-old boy who they now say died of avian flu last weekend. They had said his death was caused by pneumonia. His sister died today and two other siblings are hospitalized with flu symptoms.

Health authorities have confirmed that the strain of flu that killed the boy and his sister was of the H5 variety, but said further testing will be required to determine if it is the H5N1 strain that killed more than 70 people in Southeast Asia in 2005.

The children worked on a poultry farm and allegedly became infected after eating an infected bird. The World Health Organization says that there still are no confirmed cases of human-to-human transmission of the virus.

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