How Widespread is Lyme Disease?

LD accounts for 90% of vector-borne infections in the U.S. From 1980 to 2005 268,330 cases have been reported from 49 states. (For the latest figures go here.)

Montana is the only state having no federally reported cases of Lyme disease. Those patients who have acquired the infection in their state are not yet being reported past the state level.

Due to underreporting, the disease case count is likely to be 13 - 15 times higher. However, those are the cases that fit the government narrow case reporting criteria. The true number of cases may be significantly higher.

Evidence of infection has been found on all continents - from positive cultures, to positive antibody tests with clinical signs, to infected ticks on birds.

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