Key changes detected in Expt. 1 (day 5 post-challenge) and Expt. 2 (day 2 post-challenge). Summary of mean infection-associated fold changes in the expression levels of key groups of transcripts detected from the microarray analyses. Transcripts are grouped as follows according to associated function/cell type; a) cytotoxicity, b) mucus composition, c) heat shock response, d) proinflammatory response, e) tissue remodelling (matrix metalloproteinases and inhibitors), f) nutritional (lysozyme family), g) unknown (MALAT). The groups being compared are indicated on the y-axis.