However, Raman et al found Pa‐positive cultures from the sinuses of p.Phe508del‐heterozygous children with normal or intermediate sweat values (in a group of 58 Caucasian children with chronic CRS, without diagnostic criteria for CF, who underwent sweat testing and genotyping for CFTR mutation using an assay that detects 90% of mutations).13 Here, CFTR is linked to cystic fibrosis.