In case MABSC infection is present, the low (although significant) variation in the production of the Th17-associated cytokine IL-17 upon MABSC challenge suggest a low neutrophil recruitment, unlike what has been shown in P. aeruginosa lung infection in CF (Moser et al., 2000; Moser et al., 2005; Hartl et al., 2006). This evidence concerns the gene IL17A and cystic fibrosis.