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CROSS-IMMUNITY EXPERIMENTS BETWEEN DIFFERENT SPECIES OR STRAINS OF LEISHMANIA IN RHESUS MACAQUES (MACACA MULATTA)

This study evaluates cross-immunity in rhesus monkeys (Macaca mulatta) previously infected with one species of Leishmania and have had self-cured disease or were cured by antimony-based therapy upon development of full-blown disease. We found that a self-healing cutaneous leishmaniasis (CL) following experimental infection with Leishmania (Leishmania) major induces significant protection for L. (L.) amazonensis and L. (Viannia) guyanensis, and was dependent on time of re-challenge by L (L.) amazonensis after animals had recovered from primary lesions, but lacked protection against L. (V.) braziliensis. In contrast, monkeys that recovered from L. (V.) braziliensis CL or L. (L.) chagasi visceral leishmaniasis following chemotherapeutic intervention were protected by challenge with L. (V.) braziliensis and L (L.) amazonensis. These findings indicate the relative variability in protection after self-cure or drug-cured experimental leishmaniasis to challenge by heterologous leishmanial parasites. Further studying the immune response may provide information regarding relevant factors influencing cross-protective immunity.

Received April 9, 2003. Accepted for publication August 27, 2003.

Acknowledgments: We thank Dr. Antonio da Mota Marinho and the staff of the FIOCRUZ Animal Care Facility for their assistance with daily care and procedures on the macaques.

Financial support: This work was supported in part by FIOCRUZ; FAPERJ; CNPq/PRONEX 3 (Brazil).

Authors’ addresses: Renato Porrozzi, Departments of Immunology and Ultrastructural and Cell Biology, Instituto Oswaldo Cruz/FIOCRUZ, Av. Brasil 4365, Rio de Janeiro, RJ 21045-900, Brazil. Antonio Teva and Gabriel Grimaldi, Jr., Department of Immunology, Instituto Oswaldo Cruz/FIOCRUZ, Av. Brasil 4365, Rio de Janeiro, RJ 21045-900, Brazil, Fax: 55-21-2280-1589, E-mail: grimaldi{at}ioc.fiocruz.br. Veronica F. Amaral, Department of Immunobiology, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Niteroi, RJ 24000-000, Brazil. Marcos V. Santos da Costa,

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