Medicine: The MS Mystery

Canines may be the culprits carrying a slow virus

Researchers seeking the cause of multiple sclerosis, a disabling disease involving damage to the protective sheathing around nerve fibers, have long suspected that the answer might lie in a delayed reaction to a viral infection contracted years in the past. One suspect has been the measles virus, but 90% or more of all Americans in the prevaccination era got measles, while only a fraction of 1% developed MS. Now three New Jersey physicians have developed preliminary data suggesting that exposure to pet dogs may be related to MS.

Drs. Stuart D. Cook and Peter...

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