Actinobacillus seminis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Actinobacillus,  
Actinobacillus seminis
(ex Baynes and Simmons 1960) Sneath and Stevens 1990.
Historical synonyms:
Actinobacillus seminis of Kilian and Frederiksen (1981) and Philips (1984), Phenon 14 of Sneath and Stevens
1985.
Gram-negative bacilli or cocobacilli, over 2 µm long, nonmotile, nonsporulated.
Colonies are round, graysh, semitransparent and about 1 mm in diameter after 48
hours at 37 ºC on sheep blood agar. Nonhemolytic. No growth under 15 or over 45 ºC.
Growth is aerobic, facultatively anaerobic, mesophilic, 5% CO
2 is often required on
first isolation. No growth on MacConkey agar. V-factor & X-factor independent growth.
Isolated from sheep (semen).
Bacteria has been associated with epididymitis and orchitis in rams, ovine contagious epididymitis, mastitis in ewes, polyarthritis,
posthitis and abortion in sheep.
  1. Olsen I., MØller K., 2004. Genus II. Actinobacillus. In:  Bergey’s Manual of Systematic Bacteriology, Second edition,Vol two, part B,
    George M. Garrity (Editor-in-Chief),   pp. 866-883.
  2. W.M. Janda, R. Mutters, 2006. Pasteurella, Mannheimia, Actinobacillus, Eikenella, Kingella, Capnocytophaga, and other
    miscellaneous Gram-negative rods. In: Topley & Wilson’s Microbiology and Microbial Infections, 10 edition, Vol. 2, Bacteriology,
    Edward Arnold Ltd.
  3. J. G.Holt et al., 1994. Begey’s Manual of Determinative Bacteriology, 9-edition, Williams & Wilkins.
  4. Cousins D.V. & Lloyd J.M. : Rapid identification of Haemophilus somnus, Histophilus ovis and Actinobacillus seminis using the API
    ZYM system. Vet. Microbiol., 1988, 17, 75-81.
  5. Sneath P.H.A. & Sevens M.: Actinobacillus rossii sp. nov., Actinobacillus seminis sp. nov., nom. rev., Pasteurella bettii sp. nov.,
    Pasteurella lymphangitidis sp. nov., Pasteurella mairi sp. nov., and Pasteurella trehalosi sp. nov. Int. J. Syst. Bacteriol., 1990, 40,
    148-153.
Catalase & acid production from D(+) glucose  are positive.

Alkaline phosphatase, Voges-Proskauer, urease, arginine dehydrolase, lysine
decarboxylase, indole, D(+) xylose, dulcitol, D(-) sorbitol, D(+) mannose, cellobiose,
lactose, ONPG, melibiose, sucrose (saccharose), trehalose, fructose raffinose,
dextrin, inulin, esculin, salicin & gas from D(+) glucose are negative.

Nitrates reduction, oxidase, methyl red, ornithine decarboxylase, L(+) arabinose,
meso-inositol, mannitol (late reaction), D(+) galactose & maltose are variable.
(c) Costin Stoica
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