1. Serological characterization of Haemophilus parasuis isolates from China.
- Author
-
Cai X, Chen H, Blackall PJ, Yin Z, Wang L, Liu Z, and Jin M
- Subjects
- Animals, China epidemiology, Haemophilus Infections blood, Haemophilus Infections epidemiology, Haemophilus Infections microbiology, Haemophilus parasuis immunology, Haemophilus parasuis isolation & purification, Hemagglutination Tests veterinary, Immunodiffusion veterinary, Seroepidemiologic Studies, Serotyping veterinary, Swine, Swine Diseases blood, Swine Diseases epidemiology, Antibodies, Bacterial blood, Haemophilus Infections veterinary, Haemophilus parasuis classification, Swine Diseases microbiology
- Abstract
From September 2002 to December 2004, a total of 281 strains of Haemophilus parasuis were isolated from 17 provinces of China. All these isolates were serotyped by both the gel diffusion (GD) and the indirect haemagglutination (IHA) tests. By combining the GD and IHA results, serovar 4 (24.2%) and serovar 5 (19.2%) were the most prevalent serovars, followed by serovars 13 (12.5%), 14 (7.1%) and 12 (6.8%), while 12.1% of the isolates could not be assigned to a serovar (nontypable). A comparison of the number of isolates obtained from the respiratory tract of swine without polyserositis with those obtained from swine with polyserositis revealed an increased frequency of serovar 4 and a significantly decreased frequency of serovar 13 among isolates from the respiratory tract of swine without polyserositis, whereas the frequency of isolation of serovars 5, 12, 14 and nontypable from swine with or without polyserositis were similar. Co-infection of H. parasuis and other bacterial agents was studied in 183 cases examined from June 2003 to December 2004. Streptococcus suis (30.6%; 56), Escherichia coli (21.9%; 40), Bordetella bronchiseptica (21.3%; 39) and Pasteurella multocida (14.2%; 26) were the bacterial agents frequently co-isolated with H. parasuis in China.
- Published
- 2005
- Full Text
- View/download PDF