"The occurrence of mosquitoborne diseases was marked by virus epidemics.
Transmission in Puerto Rico, the U.S. Virgin Islands, and American Samoa accounted for most reports of dengue, chikungunya, and Zika virus diseases;
West Nile virus was endemic, and periodically epidemic, in the continental United States."
CDC : "This report examines trends in occurrence of nationally reportable vectorborne diseases during 2004–2016."
News source : https://www.cdc.gov/mmwr/volumes/67/wr/mm6717e1.htm?s_cid=mm6717e1_w
"The number of annual reports of tickborne bacterial and protozoan diseases more than doubled during this period, from 22,000 in 2004 to 48,000 in 2016.
Lyme disease accounted for 82% of all tickborne disease reports during 2004–2016.
"The occurrence of mosquitoborne diseases was marked by virus epidemics.
Transmission in Puerto Rico, the U.S. Virgin Islands, and American Samoa accounted for most reports of dengue, chikungunya, and Zika virus diseases;
West Nile virus was endemic, and periodically epidemic, in the continental United States."