Table 1. Moraxella catarrhalis strains used in the present study.

Strain	Phenotype	Reference
BBH18 wt	Clinical isolate, wild type	[42]
BBH18 Δ mid	MID-deficient	[67],[68]
BBH18 Δ uspA1	UspA1-deficient	[60]
BBH18 Δ uspA2	UspA2-deficient	[60]
BBH18 Δ uspA1/A2	UspA1/A2-deficient	[60]
BBH18 Δ mid/uspA1/2	MID and UspA1/A2-deficient	[60],[67]
KR971	Clinical isolate from a 9 year-old child with sinusitis	this study