Endrin, a chlorinated hydrocarbon insecticide, produces hyperexcitability of the human central nervous system. Acute endrin poisoning from bread made with contaminated flour resulted in sudden convulsions in three people. Recoveries were spontaneous, and symptoms were minimal. The endrin content was determined for the contaminated bread, the contaminated flour, and the specimens from four persons who had eaten the bread.
Coble Y, Hildebrandt P, Davis J, Raasch F, Curley A. Acute Endrin Poisoning. JAMA. 1967;202(6):489-493. doi:10.1001/jama.1967.03130190095013