A crude capsular polysaccharide extract as a potential novel subunit vaccine with cross-protection against the most prevalent serovars of Glaesserella (Haemophilus) parasuis in the Czech Republic

https://doi.org/10.17221/71/2019-VETMEDCitation:Matiaskova K., Nedbalcova K., Tesarik R., Kudlackova H., Gebauer J., Toman M., Faldyna M. (2019): A crude capsular polysaccharide extract as a potential novel subunit vaccine with cross-protection against the most prevalent serovars of Glaesserella (Haemophilus) parasuis in the Czech Republic. Veterinarni Medicina, 64: 392-399.
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Glaesserella (Haemophilus) parasuis is a part of the normal flora of the respiratory tract of pigs. However, under certain conditions it can also induce severe systemic disease with high morbidity and mortality leading to gross economic losses in the pig industry. The most prevalent serovars in pig herds in the Czech Republic are the virulent serovars 1, 4, 5 and 13. The currently available commercial vaccines are inactivated vaccines with certain limitations, such as no or poor cross-serovar protection. Therefore, the aim of the present study was to construct a subunit vaccine with a crude capsular polysaccharide extract (cCPS) isolated from G. parasuis CAPM 6475 (serovar 5) and evaluate its immunogenicity in a mouse model. Mice were immunised subcutaneously with two doses of the constructed vaccine in a 14-day interval and challenged intraperitoneally with various G. parasuis strains (serovars 1, 4, 5, 13) at 21 days after the second immunisation. The results of the ELISA test showed that the boost dose of the vaccine induced the production of IgG antibodies in high levels. On the basis of the death cases, the pathological findings and the bacterial isolation, the mice immunised with the cCPS were partially protected against the challenge with the homologous serovar 5 as well as with heterologous serovars 1, 4 and 13 of G. parasuis. The cross-reaction of the mixed serum from the immunised mice with the tested serovars was seen in the western-blotting also. Moreover, the most abundant protein found in the cCPS by mass spectrometry was catalase, a protein of molecular weight 55 kDa that may correspond to the strongest reaction seen in the western-blotting. Our findings indicated that the crude capsular polysaccharide extract may provide an effective immunogenicity in preventing a G. parasuis infection caused by the most prevalent serovars in the Czech Republic. However, the evaluation of the efficacy needs to be performed in pigs before any conclusions can be drawn.

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