Doctors must rush to save a man bitten by his pet snake, a Southern Pacific rattler whose poison rapidly destroys human flesh. Also, following the movements of rattlesnakes in the desert.
A middle-aged pedestrian with a heart condition is bitten on the leg by a rattlesnake; a boy who thinks he may have a snake bite is flown directly from the desert to a hospital emergency room; a man stung by bees has an allergic reaction.
A 70-year-old man with diabetes and a heart condition is flown to the ER after being bitten by a snake; a hiker's hand swells up after a rattlesnake bite; an asthmatic girl is bitten on the leg by a brown recluse spider.