A mouse model of Leishmania braziliensis braziliensis infection produced by coinjection with sand fly saliva

doi:10.1084/jem.173.1.49

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A mouse model of Leishmania braziliensis braziliensis infection produced by coinjection with sand fly saliva

J Samuelson, E Lerner, R Tesh and R Titus
Department of Tropical Public Health, Harvard School of Public Health, Boston, Massachusetts 02115.

To development a reliable murine model of Leishmania braziliensis braziliensis infection, parasites were injected into BALB/c mice in the presence of phlebotomine sand fly salivary gland lysates, which have previously been shown to greatly increase the infectivity of L. major in mice. When injected with salivary gland lysates, L. braziliensis braziliensis produced progressively enlarging cutaneous nodules, containing many macrophages filled with Leishmania amastigotes. In contrast, L. braziliensis injected without gland extracts produced small and rapidly regressing lesions. Isoenzyme analysis, monoclonal antibodies, and the polymerase chain reaction with L. braziliensis- specific oligonucleotide primers and probes confirmed that parasites causing the lesions were L. braziliensis.
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