Additional file 1: Table S1. PCR primer sequences for NTHi and Mcat genes. Figure S1. NTHi gene RNA concentrations in NTHi positive samples did not differ between stable visits (ST) and exacerbation visits (EX). Figure S2. Mcat gene RNA concentrations in Mcat positive samples did not differ between stable visits (ST) and exacerbation visits (EX). Additional methods