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Lung Disease & Respiratory Health Center

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New Clues on Killer Pneumonia Outbreak

Mysterious Illness Called SARS Continues to Spread, Potential Virus Identified

WebMD Health News

March 19, 2003 -- The number of people sickened by a mysterious deadly pneumonia called SARS continues to grow as researchers zero in on a potential cause.

The World Health Organization now estimates that 264 people have been diagnosed with SARS (severe acute respiratory syndrome), including nine deaths. Although no cases have been confirmed in the U.S., the CDC announced today that they are investigating 11 possible cases in people who recently returned from travel in the affected areas of Southeast Asia.

"The 11 cases we are reporting today have the travel history, fever, and respiratory symptoms that fall into the definition of a suspect case," says CDC Director Julie Gerberding, MD, in a briefing today. "We may find a completely unrelated cause for their illness, but for now they are on the suspect list."

WHO officials say SARS continues to spread to new countries, and cases have been reported in Canada, China, Taiwan, Germany, Hong Kong, Singapore, Slovenia, Thailand, Vietnam, and the United Kingdom. The vast majority of the cases of the pneumonia are concentrated in Hong Kong, Hanoi, Vietnam, and Singapore. All other reported cases have been linked to travel within the past 10 days to one of these affected areas.

Investigators also announced a potential break in efforts to identify a cause of the deadly pneumonia. Three separate laboratories in Germany and Hong Kong identified a strain of microbes that resemble the paramyxovirus, a family viruses that causes measles, mumps, and canine distemper, in samples from nasal swabs of two SARS patients.

But experts stress that this finding is preliminary and based on only a small number of the more than 200 cases reported. In addition, even if the presence of this virus is confirmed, it is still not clear at this point whether the virus is the cause of SARS or just a coincidental finding.

"Seeing something in a nasal swab is not the same thing as finding a causal relationship," says Gerberding. "A great deal more work needs to be done to determine if it is the cause of the infection."

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