Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (6): 1408-1418.doi: 10.11843/j.issn.0366-6964.2020.024

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Correlation between Virulence of Haemophilus parasuis in Mice and Piglet

LI Feiyue1, CHEN Kunpeng1, DING Wenwen1, XUE Yun1, WANG Chen1,2, SI Lifang1,2, ZHAO Zhanqin1,2*   

  1. 1. Laboratory of Veterinary Biologics Engineering, College of Animal Science and Technology, Henan University of Science and Techology, Luoyang 471003, China;
    2. Key-Disciplines Laboratory of Safety of Environment and Animal Product, College of Animal Science and Technology, Henan University of Science and Techology, Luoyang 471003, China
  • Received:2019-12-25 Online:2020-06-25 Published:2020-06-23

Abstract: In this study, we compared the virulence of the most prevalent Haemophilus parasuis (36 strains) serovars 4, 5, 12, and 13 in China in BALB/c mice and piglets models. The results of mice virulence tests showed that the LD50values of the four serotype strains were 9.80×107-4.60×109CFU (serovar 4),2.10×108-8.85×109 CFU (serovar 5),4.81×107-7.01×109 CFU (serovar 12) and 1.75×108-8.45×108 CFU (serovar 13), respectively. Serovar 13 was the most highly virulent serovar in mice, followed by serovars 4, 12, 5. However, there was a significant difference in virulence only between serovars 5 and 13 (P<0.05).The results of piglet virulence tests showed that the virulence of different strains in the same serovar were remarkably different, including virulent strains and weak strains. Serovar 5 was the most highly virulent in piglet, followed by serovars 13, 4, 12,but there were significant differences between serovars 5 and 4 (P=0.039), serovars 5 and 12 (P=0.033), and there was no significant difference between serovars 5 and 13 (P=0.241). Comparing the results of HPS virulence tests on mice and piglets, three conclusions can be drawn:first, the overall virulence of the four domestic epidemic serotypes from strong to weak were serovars 5, 13, 4 and 12 in turn; Second, there were both strong and weak strains in the same serotype, so there was no correlation between the serovar and virulence of HPS. Third, although HPS can kill BALB/c mice, its virulence result was not consistent with the piglet virulence test, indicating that it has some defects as an alternative model.

Key words: Haemophilus parasuis, serotype, virulence, mice, piglet, correlation

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