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C57BL\/6 chimeras reconstituted with cFMS\u2013enhanced green fluorescent protein (EGFP) bone marrow (BM) showed large numbers of peripherally derived (GFP+) microglia expressing GR1+(Ly6C+) at day 7 p.i., suggesting that the inflammatory monocyte is a microglial precursor. This was confirmed by adoptive transfer of labeled BM (Ly6Chi\/CD115+) or circulating inflammatory monocytes that trafficked to the WNV-infected brain and expressed a microglial phenotype. CCL2 is a chemokine that is highly expressed during WNV infection and important in inflammatory monocyte trafficking. Neutralization of CCL2 not only reduced the number of GFP+ microglia in the brain during WNV infection but prolonged the life of infected animals. 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