6Nielsen R. Pathogenicity and immunity studies of Haemophilusparasuis sexotypes[J] .Acta Vet Scand, 1993, 34(2) :193- 198.
7Kielstein P, Rapp - Gabrielson V J. Designation of 15serovars of Haemophilus parasuis on the basis of i mmunodiffusionusing heatstableantigenextracts[J],JClin22Microiol, 1992, 30(4): 862- 865.
8Rosner H, Kielstein P, Muller W, et al. Relationship betweenserotype, virulence and SDS- PAGE protein patternsof Haemophilus parasuis[ J]. Dtsch TierarztlWochenschr, 1991, 98(9)327- 330.
9Ruiz A.Outer membeerane proteins and DNA profiles instrainsof Haemophilus parasuis recovered from systemicandrespiratory sites[ J]. J Clin Microbiol, 2001, 39(5) : 1757- 1762.
10Lrichtensteiger C A, Vimr E R. Purification andrenaturationof membrane neuraminidase from Haemophilus parasuis[J]. Vet Microbiol, 2003, 93(1) : 79- 87.
