Experimental Salmonellosis VI. In Vitro Transfer of Cellular Immunity of Mouse Mononuclear Phagocytes

Abstract
A culture medium of the mononuclear phagocytes (monocytes) of mice immunized with live vaccine of Salmonella enteritidis contains the transfer agent (TA) of cellular immunity from immune to non-immune monocytes. The TA is of ribonucleic acid nature, is nondialyzable through cellophane, and maintains its active state for 3 months in a frozen state (-10C) and for 24 hr at 37 C.