borrelia andersonii borrelia andersonii borrelia andersonii is a spirochete bacterium. it can be pathogenic, being involved in cases of lyme borreliosis. borrelia andersonii scientific classification domain: bacteria phylum: spirochaetota class: spirochaetia order: spirochaetales family: borreliaceae genus: borrelia species: b. andersonii binomial name borrelia andersoniimarconi et al. 1995