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Clearance of Salmonella Typhimurium in Mice and Immunity to Mouse Typhoid: A Comparison of the Activities of Hyperimmune Rabbit -Globulin and Porter's Fragment I Obtained by Papain Hydrolysis¹

From the Department of Microbiology, College of Medicine, University of Florida, Gainesville, Florida

Abstract

Fragment I was isolated from rabbit -globulin which contained antibodies to Salmonella. On a weight basis the fragment I and -globulin were compared as to their ability to promote phagocytosis, protect mice against infection with Salmonella typhimurium, and prepare bacteria for the bactericidal effect of complement. Fragment I retains 1 to 2% of the activity of intact -globulin in clearance and protection tests. It retains no activity in the bactericidal test nor in the sensitization of red cells for complement lysis. Although certain components of complement may be involved, the complete system as defined by hemolytic activity or bactericidal activity is not essential either for opsonization of Salmonella or for preparation for in vivo kill.

Footnotes

¹ This investigation was supported by Public Health Service Grant AI 03798-05 from the National Institute of Allergy and Infectious Diseases.

² Trainee in Microbiology supported by Public Health Service Grant 5TI AI 0128-04 from the National Institute of Allergy and Infectious Diseases.

³ Present address: Missionsstrasse 33, Basel, Switzerland.

A report describing some of these experiments was submitted to the faculty of medicine, University of Basel, Switzerland, to fulfill the requirements for the M.D. degree.