A rabid beaver bit a girl as she was swimming in Lake Lanier near Gainesville, Georgia, the first such attack in decades, officials said.

Hall County Animal Control Field Supervisor Kevin Buecker told WDUN that the girl was swimming on private property at the northern end of the lake on Saturday when the beaver bit her on the leg. The girl’s father then swiftly beat the beaver to death, WDUN reported.

The Hall County Government said Tuesday that the beaver’s body was sent to the Georgia Public Health Lab in Decatur, where it tested positive for rabies.

The Georgia Department of Natural Resources told FOX 5 Atlanta that this is the first such beaver attack in over 20 years.

GEORGIA ROLLER COASTER STALLS MID-RIDE AFTER ‘SAFETY FEATURE’ ACTIVATES: ‘I HAD A PANIC ATTACK’

A beaver swimming

A beaver swims in the Boise River near 32nd Street in Garden City, Idaho, in April. (Sarah A. Miller/Idaho Statesman/Tribune News Service via Getty Images)

DNR Wildlife Resources Supervisor Don McGowan told WSB-TV that a game warden described the animal as "the biggest beaver he’s ever seen."

"He estimated it at 50 or 55 pounds which is about as big as they get in Georgia," McGowan added.

A sign by the lake

A girl swimming in Lake Lanier was bitten by a beaver. (Moses Robinson/Getty Images)

What provoked the animal's aggression is not immediately clear, as officials said there was no indication it could have been protecting baby beavers in the area, WDUN reported.

BOBCAT THAT ATTACKED SLEEPING CAMPER IN CONNECTICUT TESTS POSITIVE FOR RABIES

McGowan said the rabies infection could have been responsible.

"Once that rabies virus gets into the brain of the animal – in this case, a beaver – they just act crazy," he said.

Lake Lanier beach information sign

Lake Lanier on July 22, 2012, in Atlanta, Georgia (Moses Robinson/Getty Images)

Since the attack, the county placed a rabies warning sign near the Sardis Creek Boat Ramp.

Vaccines for rabies are readily available and cheap for people attacked by rabid animals or pet owners who wish to prevent infection.

A beaver chewing

A beaver chews on a stick in the Boise River in Garden City, Idaho, in late April. (Sarah A. Miller/Idaho Statesman/Tribune News Service via Getty Images)

CLICK HERE TO GET THE FOX NEWS APP

According to FOX 5, vaccines are available for just $10 in the Hall County Animal Shelter.