From 2004 to 2016 diseases spread by flea, mosquito and tick bites tripled in the U.S., according to a new study by the Centers for Disease Control. The increase includes viruses like West Nile, Zika and chikungunya, but it was Lyme Disease that accounted for 80 percent of incidents. We examine what’s causing the surge of tick-borne diseases and how Lyme Disease in particular is affecting Northern California.
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