A Lyme disease primer as the tick population rises

Although a variant was first reported in Europe in 1883, the first known outbreak of what has come to be known as Lyme disease (LD) occurred in Old Lyme, Conn., in 1975. 

LD has spread across the country to all 50 states and is now the most common tick-borne disease in the Northern hemisphere with more than 30,000 diagnosed and reported each year (a small fraction of the population that has actually been infected). 

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