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As a mysterious respiratory illness spread to more countries, the World Health Organization has taken the rare step of issuing a health alert, declaring the ailment 'a worldwide health threat' and urging all countries to help in seeking its cause and control. The agency said that in the past week it had received reports of more than 150 new suspected cases of the illness, now known as severe acute respiratory syndrome, or SARS. The syndrome has caused at least nine deaths, the latest victim a nurse in Hanoi. Some victims have recovered, but no one has done so in the past two weeks. The ailment apparently does not respond to anti-viral and antibiotic drugs. Reported cases have come from Canada and six countries in Asia Hong Kong and elsewhere in China, Indonesia, the Philippines, Singapore, Thailand and Vietnam the health organization said. There have been no reports of the illness in the United States, but on Saturday a sick passenger and two companions who traveled from New York City were removed from a flight after it arrived in Frankfurt and put in isolation in a German hospital. On Sunday, doctors at the hospital were monitoring the condition of the male passenger, his wife and another traveling companion. The 32-year- old man showed symptoms of pneumonia and was being treated with antibiotics, Dr. Hanns-Reinhardt Brodt said at a news conference, The Associated Press reported. X-rays and laboratory tests showed that the man a doctor from Singapore who treated one of the earliest cases there and who was returning from a medical meeting in New York City had 'worsened slightly' overnight, Brodt said. The doctor may have gone to a hospital in New York before flying back to Singapore via Frankfurt, according to the World Health Organization

The passenger is a doctor from Singapore who treated one of the earliest cases there, and who flew to a medical meeting in New York City, said Dick Thompson, a spokesman for WHO. The doctor may have gone to a hospital in New York - the agency is not certain which one - before getting on a flight back to Singapore via Frankfurt with his wife and another doctor. Before boarding the flight, the doctor called a colleague in Singapore to describe his symptoms, and the colleague notified the World Health Organization. The cause has not been identified. Scientists do not know whether it is a virus or even an infectious agent. Although health officials have suspected avian influenza, which has infected a small number of people sporadically in Hong Kong since 1997, laboratory tests have not detected that rare strain, known as influenza A(H5N1). As a result, laboratory scientists are focusing on the possibility of a previously unknown infectious agent

The agency said that in the last week it had received reports of more than 150 new suspected cases of the illness, now known as severe acute respiratory syndrome, or SARS. The syndrome has caused at least nine deaths. Some victims have recovered, but no one has been up, around and healthy in the past two weeks. It apparently does not respond to anti--viral and antibiotic drugs. The cause has not been identified. Scientists do not know whether it is a virus or even an infectious agent. Although health officials have suspected avian influenza, which has infected a small number of people sporadically in Hong Kong since 1997, laboratory tests have not detected that rare strain, known as influenza A(H5N1). Laboratory scientists are focusing on the possibility of a previously unknown infectious agent. Reported cases have come from Canada and six countries in Asia -- Hong Kong and elsewhere in China, Indonesia, the Philippines, Singapore, Thailand and Vietnam, the health organization said

The passenger is a doctor from Singapore who treated one of the earliest cases there, and who flew to a medical meeting in New York, said Dick Thompson, a spokesman for WHO. The doctor may have gone to a hospital in New York -- the agency is not certain which one -- before flying back to Singapore via Frankfurt with his wife and another doctor. Before boarding the flight, the doctor called a colleague in Singapore to describe his symptoms, and the colleague notified WHO. In an emergency advisory issued Saturday, the WHO, an arm of the United Nations based in Geneva, said 'there is presently no indication to restrict travel to any destination.'

Although health officials have suspected avian influenza, which has infected a small number of people sporadically in Hong Kong since 1997, laboratory tests haven't detected that rare strain, known as influenza A(H5N1). As a result, laboratory scientists are focusing on the possibility of a previously unknown infectious agent. WHO and U.S. officials urged all travelers to be aware of the main symptoms and signs. In addition to the breathing problems, the illness can cause a dry cough and other flulike symptoms that apparently develop about two to seven days after exposure. They usually start with a sudden onset of high fever and go on to include muscle aches, headache, sore throat and shortness of breath. A woman, Kwan Sui-chu, died shortly after her return. Five other family members who hadn't been to Hong Kong have since become ill; four still are in the hospital while the fifth, Kwan's son, Chi Kwai Tse, died March 13, according to Toronto Public Health officials

The passenger is a doctor from Singapore who treated one of the earliest cases there, and who flew to a medical meeting in New York City, said Dick Thompson, a spokesman for WHO. The doctor may have gone to a hospital in New York -- the agency is not certain which one -- before flying back to Singapore via Frankfurt with his wife and another doctor. Before boarding the flight, the doctor called a colleague in Singapore to describe his symptoms, and the colleague notified the World Health Organization. WHO and U.S. officials urged all travelers to be aware of the main signs. In addition to the breathing problems, the illness can cause a dry cough and other flulike symptoms that apparently develop about two to seven days after exposure. They usually start with a sudden onset of high fever and go on to include muscle aches, headache, sore throat and shortness of breath. Thompson said the cases in Toronto involved a family who returned home after flying to Hong Kong. A woman, Kwan Sui-chu, died shortly after her return. Five other family members who had not been to Hong Kong have since become ill; four are still in the hospital while the fifth, Kwan's son, Chi Kwai Tse, died on March 13, according to Toronto Public Health officials

The ill passenger is a doctor from Singapore who treated one of the earliest cases there, and who flew to a medical meeting in New York City, said Dick Thompson, a W.H.O. spokesman. The doctor may have gone to a hospital in New York -- the agency is not certain which one -- before flying back to Singapore via Frankfurt with his wife and another doctor. Before boarding the flight, the doctor called a colleague in Singapore to describe his symptoms, and the colleague notified the World Health Organization. Mr. Thompson, the spokesman for the W.H.O., said the cases in Toronto involved a family who returned home after flying to Hong Kong. A woman, Kwan Sui-chu, died shortly after her return. Five other family members who had not been to Hong Kong have since become ill; four are still in the hospital while the fifth, Mrs. Kwan's son, Chi Kwai Tse, died on March 13, according to Toronto Public Health officials. Toronto health officials said they were aware of two other cases in Vancouver, both people who had recently traveled to Hong Kong. C.D.C. officials are aiding in the investigation because Mrs. Kwan's daughter, who is being treated in Toronto, had flown to Atlanta recently, Mr. Thompson said

The passenger is a doctor from Singapore who treated one of the earliest cases there, and who flew to a medical meeting in New York City, said Dick Thompson, a spokesman for WHO. The doctor may have gone to a hospital in New York -- the agency is not certain which one -- before flying back to Singapore via Frankfurt with his wife and another doctor. Before boarding the flight, the doctor called a colleague in Singapore to describe his symptoms, and the colleague notified the World Health Organization

WHO and U.S. officials urged all travelers to be aware of the main symptoms and signs. In addition to the breathing problems, the illness can cause a dry cough and other flulike symptoms that apparently develop about two to seven days after exposure. They usually start with a sudden onset of high fever and go on to include muscle aches, headache, sore throat and shortness of breath. The Seattle Times: Cases of respiratory illness prompt health alert: Worldwide alert issued over mystery illness (GH9EHHRV) photo; The Seattle Times: Cases of respiratory illness prompt health alert (GH9EHHRV); Christian Keenan / Getty Images : Hospital staff members at the Prince of Wales hospital take preventive action by wearing face masks in Hong Kong. (0392929171)

The cause has not been identified. Scientists do not know whether it is a virus or even an infectious agent. Although health officials have suspected avian influenza, which has infected a small number of people sporadically in Hong Kong since 1997, laboratory tests have not detected that rare strain, known as influenza A(H5N1). As a result, laboratory scientists are focusing on the possibility of a previously unknown infectious agent. The passenger is a doctor from Singapore who treated one of the earliest cases there, and who flew to a medical meeting in New York City, said Dick Thompson, a spokesman for WHO. The doctor may have gone to a hospital in New York -- the agency is not certain which one -- before flying back to Singapore via Frankfurt with his wife and another doctor. Before boarding the flight, the doctor called a colleague in Singapore to describe his symptoms, and the colleague notified the World Health Organization