Difference in terminology accepted in our and foreign countries for designating disease of post-vaccination period is shown. Analysis ofthe existing regulating documents in Russian Federa- tion regarding registration of adverse events in post-vaccination period and system of registration accepted in many countries of the world and recommended by WHO is presented. In Russian Federation in accordance with the documents ofthe Federal Service of Surveillance for Protection of Consumers Rights and Human Welfare only certain conditions (post-vaccinal complications) are subject to registration. In accordance with WHO recommendations. all adverse events taking place 1 month after the vaccination must be registered. Summarization of these data allows to detect interconnection between these conditions and vaccination or prove the lack thereof.