brachyspira aalborgi brachyspira aalborgi brachyspira aalborgi is a species of bacteria, one of the causative agents of intestinal spirochetosis. its cells are anaerobic, sigmoidal with tapered ends, 2 to 6 µm long. four flagella are inserted at each end of the cells. the maximal cell width is about 0.2 µm. the type strain is 513a (nctc 11492). brachyspira aalborgi scientific classification domain: bacteria phylum: spirochaetota class: spirochaetia order: brachyspirales family: brachyspiraceae genus: brachyspira species: b. aalborgi binomial name brachyspira aalborgihovind-hougen et al. 1982