University College of London researchers examined more than 100,000 people with herpes zoster or shingles and over 200,000 people in the same age group with neither disorder.
Findings show people under age 40 were 74% likely to have a stroke if they already had shingles.
Doctors believe people with shingles should be screened for stroke risk factors.
Dr. Jennifer Frontera of the Cleveland Clinic says, "and it may be that those general practitioners, once they diagnose somebody with herpes zoster paid a lot more attention to risk factors for stroke and other medical problems that those people might have, so it might be biased in that way, but nonetheless it never hurts to be on the safe side."
Findings appear in the online issue of the journal Neurology.
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