Genus I. Pasteurella Trevisan, 1887* {Octopsis Trevisan, Atti della Accad. Fisio-Medico-Statistica, Milano, Ser. 4, S, 1885, 102; Trevisan, Rendiconti Reale Institute Lombardo di Scienze e Lettere, 1887, 94; Coccobacillus Gamaleia, Cent. f. Bakt., 4, 1888, 167; Eucystia Enderlein, Sitzber. Gesell. Naturf. Freunde, Berlin, 1917, 317.) Pas.teu.rel'la. M.L. dim. ending -ella; M.L. fem.n. Pasteurella named for Louis Pasteur, the French scientist. Small, ellipsoidal to elongated rods which show bipolar staining by special methods. Gram-negative. Gelatin not liquefied. Milk not coagulated. The majority of species ferment carbohydrates but produce only a small amount of acid; no or slight lactose fermentation; no gas production. Aerobic, facultatively anaerobic. May require low oxidation-reduction potential on primary isolation. Parasitic on man, other animals and birds. The type species is Pasteurella multocida (Lehmann and Neumann) Rosenbusch and Merchant. Key to the species of genus Pasteurella. I. Grow on ordinary media. A. Non-motile. No change or slight acid in milk without coagulation. 1. Indole produced. Hydrogen sulfide produced. a. Gelatin not liquefied. 1. Pasteurella multocida. aa. Gelatin liquefied. 2. Pasteurella septicaemiae . 2. Indole not produced. a. Lactose usually attacked. Blood agar is hemolj^zed. 3. Pasteurella haemolytica. aa. Lactose not attacked. b. Gelatin liquefied. 4. Pasteurella anatipestifer . bb. Gelatin not liquefied. c. Nitrites produced from nitrates. 5. Pasteurella pestis. cc. Nitrites not produced from nitrates. 6. Pasteurella pfaffii. B. Non-motile at 37° C. Motile and flagellated at 18° to 26° C. Milk alkaline. 7. Pasteurella pseudotuberculosis. II. Do not grow on plain agar or in liquid media without special enrichment. A. Acid not produced from sucrose. 8. Pasteurella tularensis. B. Acid produced from sucrose. 9. Pasteurella novicida. 1. Pasteurella multocida (Lehmann Berlin, klin. Wochnschr., £3, 1886, 797; and Neumann, 1899) Rosenbusch and Mer- Bact^rie ovoide, Lignieres, Recueil de Med. chant, 1939. (Virus derWildseuche.Hueppe, Veter., 75, 1898, 836 (Bull. Soc. Centr.
- The manuscript covering this genus was prepared by Prof. Robert S. Breed with the
assistance of Mr. Erwin F. Lessel, Jr. and Mrs. Eleanore Heist Clise, Cornell University, Geneva, New York, and was reviewed by Dr. I. A. Merchant, Division of Veterinary Medi- cine, Iowa State College, Ames, Iowa, October, 1955.
