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This Oct. 9, 2013 photo provided by Oregon State University in Corvallis, Ore., shows an ancient fossilized tick containing bacteria similar to the ones that cause Lyme disease. Findings by George Poinar Jr. published in the journal Historical Biology in April 2014 indicate that the tick-borne disease probably existed long before there were people to get it. (AP Photo/Oregon State University)

This Oct. 9, 2013 photo provided by Oregon State University in Corvallis, Ore., shows an ancient fossilized tick containing bacteria similar to the ones that cause Lyme disease. Findings by George Poinar Jr. published in the journal Historical Biology in April 2014 indicate that the tick-borne disease probably existed long before there were people to get it. (AP Photo/Oregon State University)

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