Haemophilus parasuis was the aetiological agent of Glässer's disease characterized by fibrinous arthritis, polyserositis and meningitis. Glässer's disease has become one of the most important respiratory diseases of pigs since first reported in 1910 by Glässer. Many disadvantages, such as emergence of other diseases, use of veterinary medicines, change of temperature and farm environment, may facilitate H. parasuis to live and propagate in vivo. Thus, big economic loss was caused by H. parasuis recently. Serum tumor necrosis factor alpha (TN...
