Reinfection in American Cutaneous Leishmaniasis: Evaluation of Clinical Outcomes in the Hamster Model

Y. Osorio, S. J. Gonzalez, V. L. Gama, B. L. Travi

Research output: Contribution to journalReview article

8 Scopus citations

Abstract

There is no clear understanding of the outcome of reinfection in New World cutaneous leishmaniasis, and its role in the relationship to the development of protection or secondary disease. For this reason, reinfection experiments with homologous (Leishmania panamensis-L. panamensis) and heterologous (L. major-L. panamensis) species of leishmaniae were conducted in the hamster model. The different protocols for primary infections prior to the challenge with L. panamensis were as follows: (a) L. major, single promastigote injection, (b) L. major, three booster infections, (c) L. panamensis, followed by antimonial treatment to achieve subclinical infection, (d) L. panamensis, with active lesions, (e) sham infected, naive controls. Although all reinfected hamsters developed lesions upon challenge, animals with active primary lesions due to L. panamensis, and receiving booster infections of L. major had the most benign secondary lesions (58-91% and 69-76% smaller than controls, respectively, P<0.05). Subclinically infected animals had intermediate lesions (40-64% smaller than controls, P<0.05), while hamsters which received a single dose of L. major had no significant improvement over controls. Our results suggested that L. major could elicit a cross protective response to L. panamensis, and that the presence and number of amastigotes persisting after a primary infection may influence the clinical outcome of reinfections.

Original languageEnglish (US)
Pages (from-to)353-356
Number of pages4
JournalMemorias do Instituto Oswaldo Cruz
Volume93
Issue number3
DOIs
StatePublished - Jan 1 1998
Externally publishedYes

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Keywords

  • Hamster
  • Immunoprophylaxis
  • Leishmania major
  • Leishmania panamensis
  • Reinfection

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Immunology
  • Virology
  • Infectious Diseases
  • Microbiology (medical)

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