Neorickettsia helminthoeca Philip et al. 1953 (Approved Lists 1980) Pretzman C. Ralph D. Stothard D.R. Fuerst P.A. Rikihisa Y. 16s rRNA Gene Sequence of Neorickettsia helminthoeca and its Phylogenetic Alignment with Members of the Genus Ehrlichia 1995 45 2 207 211 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-45-2-207 7537055 Isolated from Canis domesticus. DH82 is a canine histiocytic cell line from an infected dog, maintained at Ohio State University.