kerstersia kerstersia kerstersia is a genus of gram-negative, catalase-positive, oxidase-negative bacteria from the family of alcaligenaceae. kerstersia scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: alcaligenaceae genus: kerstersiacoenye et al. 2003 type species kerstersia gyiorum species k. gyiorum k. similis