AmongtheHumanNeisseRiaandRelatedspecies,three species — N. mucosa,M. catarrhalis, andk.denitrificansreducenitrate.thenitratereductiontestisacriticaltestfordifferentiatingbetweenn.Gonorrrhoeaeandk.deniticaltestfordifferentiatingbetweeen particularlywhenstrainsofk.denitrificansappeartobegram-negativediplococciinstainedsmears。
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