Since ccl17 mRNA was upregulated at day 7 after fungal challenge with live A. fumigatus conidia in non-sensitized mice, and neutralization of CCL17 leads to a reduction of bleomycin-induced pulmonary fibrosis [69], it is tempting to hypothesize that upregulation of ccl17 at day 7 after live A. fumigatus challenge marks the shift in host-immune response from a tissue damaging, acute inflammatory response to a profibrotic repair response, and a time-dependent neutralization of ccl17 may result in reduced pulmonary fibrosis. Here, CCL17 is linked to pulmonary fibrosis.