We observed no significant phenotype differences between asymptomatic carriage and infection strains for IL-8 production in keratinocytes (p = 0.2617, two-tailed t test, t = 1.141, df = 35) (Fig. 3a), or biofilm formation (p = 0.0856, two-tailed unpaired t test, t = 1.741, df = 78) (Fig. 3b). The gene discussed is CXCL8; the disease is infection.