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The role of denitrification genes in anaerobic growth and virulence of Flavobacterium columnare

Comparative genomics analyses indicated that the Flavobacterium columnare genome has unique denitrification genes relative to Flavobacterium psychrophilum and Flavobacterium johnsoniae, including nasA (nitrate reductase), nirS (nitrite reductase), norB (nitric oxide reductase) and nosZ (nitrous oxide reductase). The current study determines the roles of nasA, nirS, norB and nosZ in anaerobic growth, nitrate reduction, biofilm formation and virulence.