Lack of Protection of Pre-Immunization with Saliva of Long-Term Colonized Phlebotomus papatasi against Experimental Challenge with Leishmania major and Saliva of Wild-Caught P. papatasi

Sami Ben Hadj Ahmed Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Belhassen Kaabi Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Ifhem Chelbi Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Mohamed Derbali Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Saifedine Cherni Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Dhafer Laouini Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Elyes Zhioua Laboratory of Vector Ecology, Laboratory of Epidemiology and Ecology of Parasites, and Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetics, Institut Pasteur de Tunis, Tunis, Tunisia; Department of Biology, University of Gafsa, Gafsa, Tunisia

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Immunity to saliva of Phlebotomus papatasi protects against Leishmania major infection as determined by co-inoculation of parasites with salivary gland homogenates (SGHs) of this vector. These results were obtained with long-term colonized female P. papatasi. We investigated the effect of pre-immunization with SGH of long-term colonized P. papatasi against L. major infection co-inoculated with SGH of wild-caught P. papatasi. Our results showed that pre-exposure to SGH of long-term, colonized P. papatasi do not confer protection against infection with L. major co-inoculated with SGH of wild-caught P. papatasi. These preliminary results strongly suggest that the effectiveness of a vector saliva-based vaccine derived from colonized sand fly populations may be affected by inconsistent immune response after natural exposure.

Author Notes

*Address correspondence to Elyes Zhioua, Laboratory of Vector Ecology, Institut Pasteur de Tunis, 13 Place Pasteur, BP 74, 1002 Tunis, Tunisia. E-mail: elyes.zhioua@gmail.com

Financial support: This study was supported by World Health Organization/Tropical Diseases Research grant A60291.

Authors' addresses: Sami Ben Hadj Ahmed, Laboratory of Vector Ecology, Institut Pasteur de Tunis, 13 Place Pasteur, BP 74, 1002 Tunis, Tunisia, and Department of Biology, University of Gafsa, Gafsa, Tunisia. Belhassen Kaabi, Laboratory of Epidemiology and Ecology of Parasites, Institut Pasteur de Tunis, 13 Place Pasteur, BP 74, 1002 Tunis, Tunisia. Ifhem Chelbi, Mohamed Derbali, Safedine Cherni, and Elyes Zhioua, Laboratory of Vector Ecology, Institut Pasteur de Tunis, 13 Place Pasteur, BP 74, 1002 Tunis, Tunisia. Dhafer Laouni, Laboratory of Immuno-Pathology, Vaccinology, and Molecular Genetic, Institut Pasteur de Tunis, 13 Place Pasteur, BP 74, 1002 Tunis, Tunisia.

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