CCL13 and infection: IL-18 was lower on day 2 than at baseline in asthmatics and significantly lower in asthmatic compared to normal subjects on day 4 (Jackson et al., 2015) and IL-4 and CCL13/MCP-4 were also decreased after infection in asthmatics on days 5 and 7 and day 2 respectively (Tables S5 and S7–9).