TABLE 1.

Characteristics of NTHi strains used in this study

Strain	Description	Reference or source
11P6H	Clinical isolate from an adult during an acute exacerbation of COPD	13
11P6HΔsiaP	11P6H with siaP gene replaced by spectinomycin resistance cassette	This study
3655	Clinical isolate from a 10-yr-old child with acute otitis media with effusion	14
86-028NP	Clinical isolate from a child with chronic otitis media	16
86-028NPΔsiaP	86-028NP with siaP gene replaced by spectinomycin resistance cassette	32
R2866	Clinical isolate from a young child with meningitis following acute otitis media	15