With 47 states reporting widespread outbreaks of the flu and Maryland reporting its first flu-related death, interest in the flu vaccination has also increased.
A packed parking lot outside a Prince George's County health clinic was the first sign things inside were busy.
With two waiting rooms filled, staff had to call in extra help.
The location was one of three offering free flu vaccinations.
By 2 p.m., two of the clinics reported seeing more than 150 people.
Dwan Little, with the Prince George's County Health Department, said, "We're almost at the end of our supply."
Little said the county can quickly replenish their supply. She added she hasn't seen this kind of interest in flu shots since the H1N1 scare a couple of years ago.
"I've never had the flu shot before," said Prince George's County resident Rhonda Miller.
Miller already got the flu. And because she suffers from asthma, she doesn't want to be dealt a round two.
Miller said, "I'm going to be brave and go ahead and get the shot done."
She came to the clinic with her co-workers. All of them work for the state as inspectors at daycare facilities. So they say it only makes sense to get the shot.
Prince George's County resident Karen Johnson added, "I didn't get a flu shot last year, and I was sick for about a month...I don't want that to happen again."
Prince George's County will offer another free clinic on Jan. 30. Interested individuals can go to Glassmanor Elementary School, located at 1011 Marcy Avenue in Oxon Hill, from 6 p.m. until 8 p.m.
For more information on Prince George's County flu vaccination clinics, click here.