A total of 112 strains representing protein I serogroups WI, WII, and WIII and six auxotypes were tested for their ability to reduce nitrite. All strains reduced 0.001% (wt/vol) potassium nitrite (KNO) within 24 h and 0.01% (wt/vol) KNOwithin 48 h. None of the strains reduced 0.1% (wt/vol) KNOeven after incubation at 37°C for 5 days, and the strains could not be cultured from these tests after incubation for 24 h. Thus, all of the strains tested were nitrite sensitive but were able to reduce subtoxic concentrations of KNO. Nitrite reduction is a species characteristic for .


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