The patient is inside the National Institutes of Health in Bethesda, as federal officials try to track down hundreds of people who may have had contact with her.
Two separate rabies exposures have health authorities warning people in Frederick County to be careful.
Frederick County authorities are urging residents to be on their guard after a man was bitten by a rabid fox near Thurmont.
Frederick County authorities say about 60 people were involved in an outdoor brawl that left four young men injured, including one who was seriously stabbed.
Cumberland officials say they have an agreement that would enable the western Maryland city to sell treated wastewater to a natural gas drilling company for an extraction technique called hydraulic fracturing.