To the Editor. —We wish to respond to the letter by Gerald M. Fenichel, MD (Archives1983;40:390) concerning "Polyradiculoneuritis Secondary to Immunization With Tetanus and Diphtheria Toxoids" (Archives1983;40:56-57). In our article, we described a young man in whom polyradiculoneuritis developed three days after immunization with tetanus and diphtheria toxoids. We stated that, to our knowledge, neurologic complications to tetanus and diphtheria toxoids had not been previously reported. Dr Fenichel described two cases,1,2purportedly complications of tetanus and diphtheria toxoids; one1occurred after diphtheria, tetanus,and polioimmunization, and the other,2after diphtheria toxoidalone. Dr Fenichel's major objection to our article appeared to be his incorrect presumption that the symptoms of polyradiculoneuritis occurred within hours of the toxoid injection, when, in fact, it was three days later, as stated in the case summary. In a report3describing 22 cases of mononeuritis and polyneuritis after tetanus