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.

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