Bias in Evaluating CNS Complications Following Pertussis Immunization

Abstract

Bias in the evaluation of CNS complications following pertus..; immunization are the following: 1) Notifications of postimmunization adverse events, 2) Publications by vaccine producers on the frequency of adverse reactions, 3) Comparison of permanent brain damage after DPT and DT immunization, 4) Pro-immunization, 5) Immunization associated viral encephalitis, 6) Accuracy of statistics, 7) Personal. A review of these points indicates an underestimation of CNS complications after pertussis immunization.After 35 years of study of pertussis postirnmunization complications, I feel qualified to comment on such bias.