Phenotypic Heterogeneity in a Cystic Fibrosis Family and the “Pseudomonas Dilemma”

We describe an unusual family in which 2 adult siblings and the son of 1 are all affected by cystic fibrosis with rare mutations and different phenotypes. We discuss the dilemma surrounding the treatment of Pseudomonas aeruginosa colonization in the asymptomatic father, while minimizing disruption to the father–son relationship.