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Associated Press
FILE - This photo combo shows, from top, a wood tick - or dog tick - clings to a pencil used for scale, in Springfield, Ill. on June 8, 2010,  mosquitoes are sorted at the Dallas County mosquito lab in Dallas on Aug. 16, 2012, and a rat wanders the subway tracks at Union Square in New York on June 15, 2010. Hantavirus, West Nile, Lyme disease and now, bubonic plague can be spread potentially by ticks, mosquitoes, and rats. (AP Photo/File)

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