Experts Study Possible Human-to-Human Bird Flu Case in Vietn（在线收听）

Experts Study Possible Human-to-Human Bird Flu Case in Vietnam

Katherine Maria

The World Health Organization says experts looking at human cases of bird flu cannot rule out the possibility that it spread among members of a family in Vietnam.

The United Nations' health agency said Sunday that the bird flu, which has killed millions of chickens across Asia, might have spread among members of a family in Vietnam.

Two sisters died a week ago; they fell ill after their brother died of an unidentified disease. His wife also contracted the bird flu, but has recovered.

WHO epidemiologists say they found no conclusive evidence linking the sisters to infected poultry. Laboratory test carried out in Hong Kong confirmed they had the H5N1 virus.

Experts say the sisters, aged 23 and 30, may have caught the disease from their brother, who was cremated after he died, before any tests were done on him.

Bob Dietz is the WHO spokesman in Vietnam. He says experts are considering the possibility of human-to-human transmission. "This is not confirmed human-to-human transmission, only that, at this point, we cannot dismiss it as not a possibility."

Scientists have long warned the H5N1 virus poses a potential threat to global health if it becomes able to spread as quickly among people as it does among chickens.

Bird flu has spread to at least 10 countries in Asia. The H5N1 virus is responsible for 10 human deaths in the past several weeks. Scientists have linked almost all human cases to contact with sick birds.

The family in Vietnam would not be the first that epidemiologists have suspected of human-to-human transmission of the disease.

In 1997, when the H5N1 virus first crossed from chickens to humans in Hong Kong, a doctor fell ill with the disease, which he may have contracted from a patient.

"The doctor became ill and was shown to be H5N1-positive. The most plausible explanation was that he contracted it from the patient."

Six of the 18 human cases in Hong Kong in 1997 died. Except for the doctor, all had been exposed to poultry.

Mr. Dietz says the possibility of human transmission does not necessarily mean the virus has changed. He notes that human cases of the bird flu are still very rare; only a few dozen people have developed it since 1997.

注释：

World Health Organization (WHO)  世界卫生组织

bird flu  禽流感

contract [5kCntrAkt] v. 感染

rule out  排除

Vietnam [9vIEt5nAm]  越南

epidemiologist [5epI9di:mI5ClEdVIst] n. 流行病学家

conclusive evidence  确证

cremate [kri5meit] vt. 火葬

transmission [trAnz5miFEn] n. 传播

positive [5pCzEtiv] adj. 呈阳性的

plausible [5plC:zEbl] adj. 似乎合理的，似乎可能的