Dr. Deborah Persaud, a virologist with Johns Hopkins Children's Center, was lead author on the report.

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When a virologist handles anything with suspected ebola, the most stringent precautions are needed.

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But the court ordered the Pakistani virologist not to leave India until it had decided on his appeal.

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Dr. Deborah Persaud, a virologist with Johns Hopkins Children's Center, was lead author on the report presented at the conference.

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"All the big pharmas are working on this, " says Chiron molecular virologist Michael Houghton, who led the group that discovered the virus in 1987.

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According to Dr. Ron Fouchier, a Dutch virologist, this mutation allows the virus to reproduce at much lower temperatures than a standard avian influenza virus.

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"Non-infectious vaccines would clearly provide a safeguard against this risk", said Dr Andrew Macadam, a virologist specialising in polio at the National Institute for Biological Standards and Control in Hertfordshire.

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Professor John Oxford, a virologist at Queen Mary University of London, believes the bioterrorism threat is "a load of old tosh" but still argues in favour of keeping the virus.

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Dr Walter Atwood, a virologist based at Brown University who worked on the study, said the drugs may prove to be an effective, ready-made therapy for PML prevention or treatment.

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"The disease is common, but the fatalities are the puzzle we're trying to figure out, " says Dr. Jim Alexander, a molecular virologist with the Atlanta-based Centers for Disease Control and Prevention.

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