TABLE 1.

Strains and plamids

Strain or plasmidRelevant genotype and/or phenotypeSource or reference
Strains
    H. ducreyi
        35000Wild type, parentStanley Spinola,     Indiana     University
        FX51735000 dsrA mutant, Cmr13
    H. influenzae RdNontypeableAmerican Type     Culture     Collection
Plasmids
    pLSKSShuttle vector without insert of dsrA, Cmr Kanr Strr Sulr43
    pUNCH1260dsrA expression vector, Cmr Strr13