Department of Agriculture officials said they were responding to reports of two human cases of West Nile fever — one confirmed, one "probable" — in the area to be sprayed. State health officials said Maryland has seen 12 confirmed human cases of West Nile fever this year.
Spraying will begin after 8 p.m. and continue into the early morning hours. Residents are advised to remain indoors during those hours.
Before the latest confirmed case in Anne Arundel County turned up, the U.S. Centers for Disease Control and Prevention said two of Maryland's human West Nile infections were in Anne Arundel County, five in Montgomery County, and one each in Baltimore, Prince George's and Harford counties, and Baltimore City. There have been no deaths.