JAKARTA - The World Health Organization (WHO) confirmed on Thursday the death of an Indonesian teenager from bird flu. A second Indonesian bird flu victim, a 37-year-old woman from Banten Province on Java island, was in hospital on Wednesday, WHO said.

China said on Wednesday that a farmer from the eastern province of Anhui had contracted H5N1, the country's first human case in months. As in other human bird flu cases in China there was no reported poultry outbreak in the area, raising questions as to how he contracted the virus.

Separately, South Korea's health ministry said on Thursday a poultry worker was infected with the H5N1 strain of bird flu late last year, but had not been seriously ill.

Most human victims of bird flu have contracted the virus from infected birds, usually chickens, ducks or geese and there is usually a surge in cases during cooler months when the virus seems to thrive.

The 37-year-old Chinese man from the eastern province of Anhui kept backyard birds, but as in other human bird flu cases in China there was no reported poultry outbreak in the area, raising questions as to how he contracted the virus.

The man developed symptoms of fever and pneumonia early last month and was discharged from hospital on Saturday, the state-run Health News said.

"In China, the challenge is now to identify where this virus is hiding and how it is circulating," Henk Bekedam, the WHO's China representative, told Reuters.

China has reported 22 human cases, including 14 deaths, since 2003 and, with the world's largest poultry population and millions of backyard birds roaming free, it is seen as a centre in the fight against the virus.

Bekedam said that as vaccination rates for birds improve in China, detecting avian influenza becomes harder and harder, offering a possible explanation for why there was no reported outbreak where the farmer lived.

Boy dies
Indonesia has the highest human death toll from bird flu of any nation, and on Wednesday that number grew to 58 when a boy, from Tangerang near Jakarta, died, said the head of the Indonesian health ministry's bird flu center Runizar Ruesin.

The boy was admitted to hospital in the capital last week and deaths among poultry in his neighbourhood had recently been reported, the WHO said in a statement posted on its Web site.

INTERACTIVE ?/font>Facts not fears Questions and answers about avian influenza

"He was washed using special protection methods to prevent contagion," but added he didn't know if it could be transmitted from human-to-human this way.

The H5N1 virus mostly affects birds, but it has infected 263 people in 10 countries since 2003, killing 157 of them.

Scientists fear the virus could mutate and spread rapidly between people, triggering a pandemic that could sweep the globe in weeks and possibly kill millions.

The outbreak of highly pathogenic H5N1 avian influenza began in Asia in 2003 and spread rapidly in early 2006.

CONTINUED: Following bird flu's spread

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