The impact of vector‐mediated neutrophil recruitment on cutaneous leishmaniasis

The dynamic process of pathogen transmission by the bite of an insect vector combines several biological processes that have undergone extensive co‐evolution. Whereas the host response to an insect bite is only occasionally confronted with the parasitic pathogens that competent vectors might transmit, the transmitted parasites will always be confronted with the acute, wound‐healing response that is initiated by the bite itself. Invariably, this response involves neutrophils. In the case of Leishmania, infection is initiated in the skin following the bite of an infected sand fly, suggesting that Leishmania must possess some means to survive their early encounter with recruited neutrophils at the bite site. Here, we review the literature regarding the impact of neutrophils on the outcome of infection with Leishmania, with special attention to the role of the sand fly bite.

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