Support WBURThe Only Good Bedbug Is A Toasted OnePlay03:50Download AudioAllison AubreyApril 14, 2009 ShareWhen they bite, Cimex lectularius — a.k.a. bedbugs — pierce the skin and inject anticoagulants, to keep the blood flowing freely, and anesthetics, so the warm body won't know it's being bitten. (CDC)