Failure to detect antihuman-immunoglobulinallotype-active antibodies in diagnostic sera directed against some enterobacteria.

Diagnostic sera to determine antigenic properties of bacteria were tested to clarify the question whether these sera also contain antibodies being active against human immunoglobulin allotypes. Sera directed against various strains of Escherichia coli, Salmonella, and Shigella were found to be negative for anti-Ig-allotype activity.