A toddler was bitten by a rattlesnake in Boulevard, Cal Fire Capt. Kendal Bortisser said.
The incident happened at 12 p.m. at Ribbonwood Road and Interstate 8 when a snake bit the child in the knee, authorities said.
The location of the victim is approximately 60 miles east of Sharp Grossmont Hospital, the nearest trauma center. A helicopter is responding to take the victim to the hospital, Bortisser said.
Parents did not release their son's condition. The toddler is estimated to be two or three years old.
The child's doctor said the boy's main symptoms are pain and swelling. Doctors have done blood work and given the child anti-venom.
Snake bites are more common during warmer months, making it even more important for parents to be vigilant when they are outside with their kids.
No other information was immediately available.