The Kings County Department of Public Health says more than 200 people were given the flu shot at an extended-hours clinic on Monday.
Tuesday, the clinic resumed its normal business hours but still saw more than 100 people who wanted to get the flu vaccine.
Kings County confirmed a third death from the H1N1 flu virus, bringing the Valley's total amount of flu related deaths to 10.
The latest victim was a middle-aged woman who was previously healthy. She had not received a flu shot.