NCIt definition : A species of obligately anaerobic, Gram positive, rod shaped bacteria in the phylum
Actinobacteria. This bacteria is non-motile, tyrosine arylamidase positive and arginine
dihydrolase negative. A. parvulum is a commensal organism of the oral cavity and associated
with periodontal health.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Atopobium parvulum.;