Cell surface ferroxidase; part of the reductive iron assimilatory system (RIA), a siderophore-independent iron acquisition process (PubMed:20507510). Required to oxidize Fe(2+) and release it from the transporter (By similarity). Seems not to be involved in virulence (PubMed:20507510). Expression is up-regulated during iron starvation (PubMed:20507510). Produces wild-type amounts of siderophores and growth at the same rate as the wild-type under iron limitation, but accumulates high levels of free intracellular iron (PubMed:20507510). Does not affect the virulence (PubMed:20507510). Belongs to the multicopper oxidase family.