Causes a highly fatal pneumonitis and sep- ticemia in man. Tissue tropism: Causes a septicemia. In man this species shows predilection for the respiratory tract. In laboratory rodents it is infective by the intranasal, intraperito- neal, intracerebral, intramuscular and sub- cutaneous routes. Antibiotic- and chemo-therapy: Same as for Miyagawanella ornithosis. Source: From the sputa and organs of in- fected persons. Habitat: The etiological agent of Louis- iana pneumonitis (Olson and Larson, U. S. Pub. Health Repts., 59, 1944, 1373); the so- called Borg strain. 8. Miyagawanella illinii Rake, 1948. (The Illinois virus, Zichis and Shaughnessy, Science, 102, 1945, 301; Rake, in Manual, 6th ed., 1948, 1119; Ehrlichia illinii Krassil- nikov. Guide to the Bacteria and Actino- mycetes, Izd. Akad. Nauk, U.S.S.R., Mos- kau, 1949, 743.) il.li'ni.i. Fr. noun Illinois a place name; M.L. gen. noun illinii (probably intended to mean) of Illinois. Coccoid cells resemble those of Miyaga- ivanella lymphogranulomatosis . Filterability: Passes through Berkefeld N and W filters. Cultivation: Grows in the yolk sac of the chicken embryo. Immunology: Distinguished from other miyagawanellae by neutralization tests in mice with chicken antisera and partly from Miyagawanella psittaci, M. ornithosis and M. pneumoniae by active immunization in mice. Pathogenic for man and for white mice. Causes a highly fatal pneumonitis in man. Tissue tropism: Infective in mice by the intranasal, intraperitoneal, intracerebral and subcutaneous routes. Source: From the lungs of infected per- sons. Habitat: The etiological agent of a highly fatal pneumonitis in man. 9. Miyagawanella opossunii (Ryzhkov, 1950) Rake, comb. nov. (Opossum virus A, Roca-Garcia, Jour. Inf. Dis., 85, 1949, 275; Chlamydozoon opossumi Ryzhkov, Voprosy Meditsinskoi Virusologii (Prob. Med. Virol.), Akad. Med. Nauk, S.S.S.R., Mos- kau, 3, 1950, 17; Rickettsiajormis opposum (sic) Zhdanov, Opredelitel Virusov Celov- ska i Zivotmych, Izd. Akad. Med. Nauk, U.S.S.R., Moskau, 1953, 185.) o.pos'su.mi. Am.Ind. noun opossum the opossum, a North and South American mar- supial; M.L. gen. noun opossumi of the opos- sum. Coccoid cells resemble those of Miyaga- wanella lymphogranulomatosis. Non-motile. Stain red-purple with Giemsa's or Wright's stain, and red with Macchiavello's and blue with Castaneda's stain. Gram-negative. Filterability: Passes through a Berkefeld V but not an N or a Seitz filter. Cultivation: Grows in tissue cultures of mouse or chicken cells and in the yolk sac of the chicken embrj^o. Immunology: Contains a group comple- ment-fixing antigen in common with the other mij^agawanellae. Shows a serological relationship to M. pneumoniae by cross- protection tests. Toxic factor: Same as for M. lymphogran- ulomatosis. Pathogenic for South American opossums, producing a central-nervous-system disease and a paralysis of the hind quarters. Patho- genic for mice and chicken embryos. Not pathogenic for pigeons or guinea pigs. Tissue tropism: Infects opossums in the laboratory by the intraperitoneal but not by the subcutaneous route. Infects mice by the intracerebral or the intranasal but not by the intraperitoneal route. Chemotherapy: Not susceptible to sulfon- amides. Source : Isolated from an opossum (Didel- phys paraguayensis) trapped in a district of the municipality of Cdqueza, State of Cun- dinamarca, Colombia. Habitat: The etiological agent of paral- ysis in opossums. 10. Miyagawanella ovis (Zhdanov, 1953) Rake, comb. nov. (Minute organisms from enzootic abortion of ewes. Stamp, IMcEwen, Watt and Nisbet, Vet. Record, 62, 1950, 251; Virus of ovine enzootic abortion. Stamp, Jour. Comp. Path, and Therap., 61, 1951, 215; also see Monsur and Barwell, Brit. Jour. Exp. Path., 32, 1951, 414; Rickettsia-
