bombella favorum bombella favorum bombella favorum is a gram-negative, aerobic and pellicle-forming bacterium from the genus of bombella which has been isolated from a honeycomb of western honey bees. bombella favorum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: acetobacteraceae genus: bombella species: b. favorum binomial name bombella favorumhilgarth et al. 2021 type strain tmw 2.1889