(CNN) – Illnesses from mosquito, tick, and flea bites more than tripled in the United States from 2004 to 2016, according to a report from the Centers for Disease Control.
The illnesses include Lyme disease, West Nile virus, Zika virus, Dengue fever, and plague.
According to the report, more than 642,000 cases of disease from the bugs were reported during the period.
Tick-borne diseases accounted for more than 75 percent of the cases.
Health experts found at least nine such diseases were newly discovered or introduced in the U.S. since 2004.
The study did not go into the reasons behind the increase.
A CDC official reminds people to take precautions to prevent bites.
Click here for some CDC guidelines on avoiding tick bites.