Lyme by the Numbers

Statistics on the tick-borne disease, as it affects Pennsylvania and the Main Line.

5,722: Number of new Lyme disease cases in Pennsylvania (2009)

50,000: Number of possible undiagnosed or unreported cases statewide

100: Number of strains of the Lyme bacterium borrelia burgdorferi

500: Number of users logging on to daily

1,300: Approximate deer population at Valley Forge National Historical Park (an eightfold increase over the past 25 years)

$2.9 million: Cost of the park’s 15-year deer-management plan

58: Number of deer per square mile in Lower Merion Township (2008)

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