bartonella melophagi bartonella melophagi "candidatus bartonella melophagi" is a candidatus species of bartonella that causes infection in humans. "candidatus bartonella melophagi" scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: bartonellaceae genus: bartonella species: "candidatus b. melophagi" binomial name "candidatus bartonella melophagi"