Abstract: In order to study the biological characteristics of Haemophilus parasuis in pig farms parts of northern Xinjiang, we used microbiology and immunology methods to isolate and identify the Haemophilus parasuis, including physiological and biochemical, cultural and molecular characteristics. Disk diffusion was selected of drug-resistant to isolates. Mice acted a pathogenicity experimental animal model. The results showed the pigs of this region had been infected by Haemophilus parasuis widespread. Five isolates not only had a stronger pathogenic to mice, but also to gentamicin sulfate and oxytetracycline hydrochloride had drug-resistant.

Key words: Haemophilus parasuis; biological characteristics; resistance; pathogenic