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A vaccine based on the Vietnamese virus would be protective for people in the Vietnam region, but less effective against viruses circulating elsewhere, Donis said.

He said perhaps scientists will one day develop a vaccine that protects against several different forms of bird flu.

The U.S.

government is already spending $250 million for about 8 million doses against the Vietnamese version of bird flu.

Federal officials contracted with two companies — Chiron and Sanofi Pasteur — for those doses, and most already have been produced, said Bill Hall, a spokesman for Health and Human Services.

The second vaccine must be developed and tested, and HHS had no estimate for the cost of that work.

The World Health Organization has reported at least 174 human cases of bird flu, including 94 deaths since 2003.

So far, most of the human victims were in close contact with infected birds.

Dr.

Margaret Chan, who is spearheading the WHO efforts against the virus, said it poses a greater challenge to the world than any previous infectious disease.

Since February, the virus has spread to birds in 17 new countries in Africa, Asia, Europe and the Middle East, Chan said.

Poland on Monday confirmed its first outbreak of the disease, saying laboratory tests found that two wild swans died of the...

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Cynthia Bulik of the University of North Carolina School of Medicine.

In the latest issue of the Archives of General Psychiatry, Bulik and colleagues studied records from 30,000 Swedish twins, some with anorexia, and found that identical twins, who share identical genes, were more likely to share an eating problem compared with fraternal twins, who share half their genes, the same as non-twin siblings.

In this large sample, scientists figured out that genes were responsible for 56 percent of the cases of the potentially life-threatening condition.

People with anorexia - about 10 out of every 1,000 women and 29 in every 1,000 men - have symptoms that include self-star...