Emergency! S03E06 - Snakebite

John, Roy, and Chet are returning from a "boring" fishing trip in a rural area when they come across a traffic accident. One man is dead, and a mother and son are injured; they have to find a local doctor to assist them. The firemen help rescue the victims of a rollover accident off a cliff; after the victims are med-evacked to Rampart, Dixie offers the assistant nurse to take on the case of a patient suffering from heart trouble, with Dr. Early, from Squad 45. John is bitten by a rattlesnake, motivating Chet to lend assistance to him, and he is rushed to Rampart atop Engine 51.