The state's first flu case of the season has been reported in the Washington suburbs, prompting state health officials to urge people to get vaccinated.
The Department of Health and Mental Hygiene said an adult was diagnosed with the respiratory disease but not hospitalized. They did not provide other details.
Yearly vaccinations are important because the strains of flu change over time, health officials said.
The U.S. Centers for Disease Control and Prevention has recommended against using the FluMist nasal spray vaccine because it may not be effective against certain strains. The agency still recommends the flu shot.
The state's first case was the H1N1 strain, which is also included in this year's vaccine formulation.
Older people, young children, pregnant woman and those with chronic medical conditions are more at risk from complications of flu.