West Nile Virus Detected in Mosquitoes Across Multiple Regions

WHO:

WHIO TV - Public Health - Dayton & Montgomery County is conducting mosquito spraying.

cbs8.com - San Diego County public health officials are addressing West Nile virus cases.

WHAT:

WHIO TV - Mosquitoes tested positive for West Nile Virus in traps at Wegerzyn MetroPark.

cbs8.com - A fourth San Diego County resident tested positive for West Nile virus this summer.

cbs8.com - No local deaths have been reported this year, but one case required hospitalization.

cbs8.com - The Vector Control Program is treating about 1,600 sites for the virus.

WHERE:

WHIO TV - The spraying will occur at Wegerzyn MetroPark, located at 1301 E. Siebenthaler Avenue, Dayton.

cbs8.com - The cases in San Diego County include areas such as Escondido, Fallbrook, Lakeside, Oceanside, Carlsbad, Chula Vista, Solana Beach, Encinitas, San Diego, Santee, Rancho Bernardo, Rancho Santa Fe, San Marcos, and 4S Ranch.

WHEN:

WHIO TV - Spraying is scheduled for tonight at dusk, weather permitting.

cbs8.com - The aerial treatment schedule includes dates:

Wednesday, Aug. 5 and Thursday, Aug. 6

Wednesday, Aug. 26 and Thursday, Aug. 27

Wednesday, Sept. 16 and Thursday, Sept. 17

Wednesday, Oct. 7 and Thursday, Oct. 8

Thursday, Oct. 29

WHY:

WHIO TV - The spraying is a response to the detection of West Nile Virus in local mosquitoes.

cbs8.com - Public health officials are taking steps to prevent mosquito bites due to the recent positive cases.

HOW:

WHIO TV - The adulticide mosquito-control product Duet will be used for spraying.

cbs8.com - Residents are advised to remove standing water and are offered free mosquito fish to control breeding.

cbs8.com - The Vector Control Program uses helicopters to drop mosquito larvicide into standing water.

(UPDATED August 6, 2026 11:27 UTC)

Public health officials in Dayton and Montgomery County are conducting mosquito spraying tonight at Wegerzyn MetroPark in response to the detection of West Nile Virus in local mosquitoes. Meanwhile, San Diego County has reported a fourth resident testing positive for the virus this summer, with no local deaths but one hospitalization linked to the cases. The Vector Control Program is actively treating around 1,600 sites for the virus and is using helicopters to drop larvicide into standing water, while residents are encouraged to eliminate standing water and can receive free mosquito fish to help control breeding.