Data are shown as mean ± SEM (Table 1) or medians (quantification and phenotype of MPs present in CF and PCD sputum). Statistical significance of differences between acute and stable groups of CF patients was evaluated by a two-tailed unpaired Student's t-test. To compare the number of MPs and the amount of different antigens the non-parametrical Mann-Whitney test was used. All data were analyzed using Prism 4 (GraphPad Software, Inc., La Jolla, CA). p values of less than 0.05 were considered significant.