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Infection-Immunity in Tularemia: Specificity of Cellular Immunity

^a Department of Microbiology, University of Montana, Missoula, Montana 59801

ABSTRACT

The relationship between hypersensitivity and cellular resistance to infection with facultative intracellular parasites was studied in mice by using infection-immunity in tularemia as a model system. Delayed hypersensitivity to antigenic fractions of Francisella tularensis was first detected 6 to 7 days after immunization with viable F. tularensis vaccine, at which time immunity against challenge infection developed. Both immunity and delayed-type sensitivity reached maximal levels by 9 to 10 days. Immediate hypersensitivity occurred after immunization with both viable and nonviable tularemia vaccines but could not be correlated with resistance since nonviable antigens were not protective. Attempts to relate resistance to F. tularensis with nonspecific immunity factors were unsuccessful. Immunization of mice with BCG vaccine stimulated protection against infection with F. novicida and Salmonella typhimurium but provided no protection against infection with F. tularensis. Moreover, viable tularemia vaccine, while inducing marked protection against challenge with specific organisms, afforded no protection against infection with S. typhimurium or S. enteritidis. It is concluded that cellular immunity in tularemia involves an immunologically specific component.

¹ Present address: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, Bethesda, Md. 20014.

This article has been cited by other articles:

• Dreisbach, V. C., Cowley, S., Elkins, K. L. (2000). Purified Lipopolysaccharide from Francisella tularensis Live Vaccine Strain (LVS) Induces Protective Immunity against LVS Infection That Requires B Cells and Gamma Interferon. Infect. Immun. 68: 1988-1996 [Abstract] [Full Text]