The victim, identified by the hospital as Andrew Costello, was bitten on his left side in his lower leg and hip and on both his hands around 12:13 p.m., Hyde County EMS Director Justin Gibbs told ABC News. He added that the victim was conscious when he got into the helicopter, where he gave a description of the attack that allowed officials to confirm he was bitten by a shark.
Costello was taken to Vidant Medical Center in Greenville, North Carolina, and listed in fair condition, the hospital said in a statement Wednesday night.
"He had been swimming in about 25-30 feet offshore in about waist-deep water with his adult son," the National Park Service said in a statement. "There were no other swimmers injured."
The alarming number of attacks in North Carolina "is an extremely dangerous situation right now," said George Burgess, who directs the Florida Program for Shark Research at Florida International University.
"There is clearly a continuing threat situation here," he told ABC News.
There are many inherent dangers while swimming in ocean or sound waters. Swimmers are advised to be aware of conditions and their surroundings.
ABC News' Matt Gutman contributed to this report.