In addition, several chemokines (macrophage inflammatory protein [MIP]-1α, MIP-1β, growth related oncogene-α, growth related oncogene-β, monocyte chemoattractant protein [MCP]-1, MCP-2, MCP-3, and MCP-4) exhibited increased transcript levels at days 4 to 6 after infection in all animals (Figure 2a). The gene discussed is CCL13; the disease is infection.