vagococcus acidifermentans vagococcus acidifermentans vagococcus acidifermentans is a gram-positive, coccus-shaped, non-spore-forming, facultatively species of anaerobic bacteria. the type strain is ac-1(t) (= kctc 13418(t) = lmg 24798(t)). vagococcus acidifermentans scientific classification domain: bacteria phylum: bacillota class: bacilli order: lactobacillales family: enterococcaceae genus: vagococcus species: v. acidifermentanswang et al. 2011