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By the indirect immunoperoxidase radial immunodiffusion technique the IgG and IgM contents in serum and filter paper eluates were found to remain essentially at equivalent levels for at least 2.5 months after collection.
Accepted for publication June 14, 1976.
* Address reprint requests to: Dr. Maria Carolina Soares Guimarães, Instituto de Medicina Tropical de São Paulo, C.P. 2921, São Paulo, Brazil.
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