Infection of NHBE cells with PA/93 or TX/02 induced apical IP-10 expression that was low at 6 h pi but significantly (p<0.05) higher than mock treated cells, and between 6 h and 24 h pi, IP-10 levels substantially increased to levels beyond the upper limits of detection of the assay system (Fig. 7E). Here, CXCL10 is linked to infection.