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Infect Immun. 1993 January; 61(1): 220-226

Persistence of virulent Leishmania major in murine cutaneous leishmaniasis: a possible hazard for the host.

T Aebischer, S F Moody and E Handman

Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Victoria, Australia.

ABSTRACT

The persistence of Leishmania major parasites in mice resistant to infection was investigated by the polymerase chain reaction and in vitro culture methods. Parasite-specific DNA was detected in the lymph nodes, spleens, bone marrow, and livers of C57BL/6 mice 1 year after their recovery from infection. Live parasites were also recovered from these tissues (except liver tissues) and were used to establish in vitro isolates. Pulsed-field gel electrophoresis, Southern blotting, and Western blot (immunoblot) analyses showed that these isolates retained the karyotype and the phenotype of the original inoculum, including the levels of expression of gp63 and lipophosphoglycan, the two major surface molecules of Leishmania species. More importantly, these isolates were virulent and induced fatal disease when injected into susceptible BALB/c mice. Persistence was shown to be a more general phenomenon, since several different strains of mice which were resistant to L. major infection also harbored persistent parasites. The implications for the etiology of human leishmaniasis in immunocompromised individuals such as AIDS patients are discussed.

Infect Immun. 1993 January; 61(1): 220-226




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