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Infect Immun. 1979 November; 26(2): 611-614

Generalized infection and lack of delayed hypersensitivity in BALB/c mice infected with Leishmania tropica major.

ABSTRACT

The susceptibility of a few strains of mice to a subcutaneous injection of Leishmania tropica major, the causative agent of cutaneous leishmaniasis in humans, was studied. The infection in six strains (CBA, AKR/J, AKR/cu, C57BL/6, A/J, and C3H) remained cutaneous, and the animals recovered within 3 to 4 months. In contast, the infection in BALB/c became generalized and killed 1005 of infected animals. Intraperitoneal injection of infected liver of BALB/c to A/J and syngeneic mice produced a lethal disease in BALB/c but no infection in A/J mice. Lower doses of the parasite produced a lethal infection in BALB/c but no apparent disease in A/J. Hence, the host rather than the parasite is responsible for the outcome of the disease. The peak antibody titer of BALB/c mice was not significantly higher than that of A/J mice. However, BALB/c failed to show any delayed hypersensitivity to leishmania tested by footpad reaction, whereas A/J mice showed a strong response.

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