French doctors estimated the disease's incubation period to be from 9 to 12 days for the second case, longer than the 7 to 10 days previously reported by others.

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Recently-delayed approvals include a new drug designed to slow the effects of Lou Gehrig's disease, the french abortion pill RU-486, and new uses for thalidomide, which caused serious birth defects when first introduced in the 1950's.

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The medicine, invented by Isis Pharmaceuticals, will be marketed by Genzyme, the rare-disease specialty unit of Sanofi, the French drug giant.

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In April, for example, according to a report in the British medical journal The Lancet, a French man who had traveled to Dubai fell ill with the disease in France, although it wasn't diagnosed immediately.

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In a small, soon-to-be published study, French researchers found the vaccine seemed to lower the risk of severe disease from the new strain in infants.

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About 18, 000 people in the U.S. with Parkinson's disease or essential tremor have had this surgery since it was first done about a decade ago by a French doctor.

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