Lyme disease vaccine trial

Researchers are seeking thousands of volunteers in the U.S. and Europe to test the first potential vaccine against Lyme disease in 20 years. Lyme is a growing threat, with cases steadily rising and warming weather helping ticks expand their habitat. While a vaccine for dogs has long been available, the only human Lyme vaccine was pulled off the U.S. market in 2002, leaving people to rely on bug spray and tick checks. (By The Associated Press)

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