Rank: Species
Lineage: Bacteria;Proteobacteria;Alphaproteobacteria;Rhizobiales;Bartonellaceae;Bartonella;Bartonella quintana
Description: This organism was first identified as the causative agent of louse-born trench fever during World War I. Up to 800 000 were infected in the trenches because of the louse insect vector that was widespread due to poor sanitation. Characterized by fever, rashes, bone pain, and enlargement of the spleen. The disease is now found associated with immunocompromized patients, especially HIV patients and homeless alcoholics. Unlike other Bartonella species, which can infect a broad range of mammels, Bartonella quintana only infects humans.
Reference Material:
https://www.ncbi.nlm.nih.gov/genome/?term=Bartonella%20quintana