On the Alleged Antigenic Relation Between ECHO Virus Types 29 and 32. ∗

Abstract

Discussion and summary

The data presented here indicate clearly that the previously reported antigenic relationship between ECHO types 29 and 32 was the result of working with a mixture of the viruses in question. No antigenic relationship between these types was detected by tube neutralization, plaque-reduction, or hemagglutination-inhibition tests when “purified” reagents were employed.