Abstract
The commercial immune serum globulin (ISG) product is suitable for use in passive immunization only by intramuscular administration; intravenous use results in vasomotor side reactions. We report the functional characterization of a chemically modified ISG (MISG) that is essentially free of nonspecific complement-binding activity and contains no new antigenic determinants. The half-life values for MISG given intravenously to rabbits, guinea pigs, and humans are shown not to be different from that of ISG. The MISG we describe is shown to fulfill the in vitro and in vivo criteria of stability, safety, function, and half-life, making it suitable for human intravenous administration.
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