Table 1. Screening of Aedes triseriatus and Aedes japonicus adult mosquitoes from gravid traps for arthropod-borne virus by using plaque assays, Appalachian Region, United States, 2015.

Collection date	Aedes triseriatus		Ae. japonicus		No. positive samples
	No. mosquitoes	No. pools*	No. mosquitoes	No. pools*
Jun 1–30	569	14	196	26	0
Jul 1–31	383	367	257	240	0
Aug 1–19	245	245	237	176	2†
Total	1,197	626	690	442	2†

*After July 21, most mosquitoes were tested individually rather than in pools.
†Two Cache Valley virus–infected adult Ae. j. japonicus mosquitoes were collected and tested individually on August 4.