Haemophilus parasuis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Haemophilus,  
Haemophilus parasuis  
Biberstein and White 1969;  four serovars (A-D, based on capsular polysaccharides) or 15 serovars (1-15,
based on heat-stable antigen extracts).
Gram-negative, pleomorphic rods, variable length, some strains form capsule.
Growth of freshly isolated strains on chocolate agar is very feeble after 2-3 days.
Colonies are smooth, grayish, translucent, small (0.5 mm in diameter) to 1-2 mm
around. Hemolysis is negative. Require V-factor but no X-factor or CO
2  for growth.
Optimum temperature 37 ºC. Growth on Mac Conkey agar is negative.
Member of the normal flora of the upper respiratory tract of swine.
Causes respiratory tract infections and polyserositis in pigs (Glasser disease).
Frequently  may be isolated from nasal cavity, tonsils and upper trachea from healthy pigs.
  1. Mogens Kilian, 2004. Genus III. Haemophilus. In: Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part B,
    George M. Garrity (Editor-in-Chief), pp. 883-904.
  2. Mary P.E. Slack, 2006. Haemophilus. In: Topley & Wilson’s Microbiology and Microbial Infections, 10 edition, Vol. 2, Bacteriology,
    Edward Arnold Ltd.
  3. J. G. Holt et al., 1994. Facultatively Anaerobic Gram-Negative Rods. Subgroup 3. Family Pasteurellaceae. In: Begey’s Manual of
    Determinative Bacteriology, 9th-edition, Williams & Wilkins, pp 194-196.
  4. Ionut Sorescu: Actualităţi privind infecţia cu Haemophilus parasuis. Buletin informativ in patologia porcina, vol. 6 nr. 1, 30-37.
  5. Costin Stoica: Species of Actinobacillus & Haemophilus with clinical significance for swine. Buletin informativ in patologie porcina,
    vol. VI, nr. 1, 26-29, 2003.
Positive results for nitrates reduction, alkaline phosphatase, catalase, acid production
from: D(+) glucose (without gas), D(-) fructose, D(+) galactose, D(+) mannose, maltose,
sucrose & inulin.

Negative results for oxidase, urease, arginine dehydrolase, lysine decarboxylase, ornithine decarboxylase, indole production, ONPG,
acid production from: glycerol, xylitol, L(+) arabinose, D(+) xylose, dulcitol, mannitol, D(-) sorbitol, L(+) rhamnose, L(-) sorbose,
cellobiose, ONPG, D(+) melibiose, trehalose, raffinose, esculin & salicin.

Variable results for alpha-glucosidase, H
2S production, acid production from: lactose & meso-inositol.
(c) Costin Stoica
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