14 people have been sent to hospital in eastern Turkey with suspected bird flu.
The news follows the death of two teenagers, a brother and sister, from a neighbouring province in the east of the country, in the first cases of bird flu outside southeast Asia.
The family lived and worked on a poultry farm in the town of Van, close to the border with Iran. It is reported that a third sibling has shown symptoms of bird flu.
A senior World Health Organisation official said the boy had probably died from the deadly H5N1 strain of the virus.
However, the Turkish Health Ministry gave no specific details and said samples had been sent to the WHO and Britain for more tests.
If the boy's death is officially confirmed as being the result of H5N1, it would be the first case outside southeast Asia where more than 70 people have been killed by the disease since 2003.
Turkey, on the path of migratory birds that are believed to spread the virus, has had two confirmed outbreaks of the highly contagious disease among poultry in the past three months.
