slackia equolifaciens slackia equolifaciens slackia equolifaciens is an equol-producing bacterium from the genus of slackia which has been isolated from human faeces from japan. slackia equolifaciens scientific classification domain: bacteria phylum: actinomycetota class: coriobacteriia order: eggerthellales family: eggerthellaceae genus: slackia species: s. equolifaciens binomial name slackia equolifaciensjin et al. 2010 type strain ccug 58231, jcm 16059, dze