Toxicological trivia from October 26, 2009: It is considered that DEET (common name for N, N-diethyl-m-toluamide, a widely used insect repellent), has a remarkable safety profile, since serious toxic effects  cases documented in the medical literature between 1960 and 2002 are:
a) Less than 50 cases;
b) Between 50 and 500 cases;
c) More than 500 cases.

Correct Answer a.Read more in Spanish  in thhe monograph: Repellents. Information Update 2009