(KRON) — A child who was taken to the hospital Wednesday afternoon after being bitten by a snake at a park is in stable condition, a state park ranger said Thursday. Crews were dispatched to Mount Diablo State Park around 4 p.m. Wednesday. The boy’s mother carried him down to a parking lot on the north side of the park near Mitchell Canyon after the bite was reported.

The 7-year-old boy was running on a trail — believed to be the Bruce Lee Spring Trail — and felt something hurt his lower leg, but never saw the snake. He later showed symptoms that were consisted with a rattlesnake bite and authorities determined the best course of action was to transport him by helicopter.

“The mom did a great job keeping her son calm,” said Mt. Diablo supervising state park ranger, Cameron Morrison.

The child was taken on a California Highway Patrol (CHP) chopper to John Muir Medical Center in Walnut Creek. The CHP said that the child was seriously injured as a result of the bite.

Rattlesnakes are prevalent in the East Bay foothills like the one where the bite happened. They are “not aggressive and generally just bite if they’re provoked or threatened,” Morrison said.

Bay City News contributed to this report.