Chief EditorK.M.L. Pathak
Print ISSN 0367-6722
Online ISSN 0976-0555
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Prototype Pentavalent Bovine Leptospira Vaccines Blended with Oil Adjuvant Provides Protection and Prevents Renal Colonization in Guinea Pig Model
First Online 02-03-2021|
Methods: An inactivated oil adjuvant prototype pentavalent bovine leptospira vaccines with serogroups Australis, Hebdomadis, Hardjo, Javanica and Pomona which were prevalent in Tamil Nadu were developed and compared with the aluminium hydroxide gel adjuvant vaccine. The humoral immune response was assessed measuring antibodies by Microscopic Agglutination Test and Cell Mediated Immune response was assessed by lymphocyte proliferation assay. The ability of these vaccines to protect Guinea pigs against virulent Leptospires challenge was also demonstrated.
Result: The prototype vaccine blended with oil adjuvants resulted in higher protective antibody titres of more than 6.64 log2 (≥1:100) than the aluminium hydroxide adjuvant blended vaccine. The protective antibody titres lasted upto 180 days, except for serogroup Javanica (150 days). The Montanide adjuvants were able to produce cell mediated immune response for protection against serovar Hardjo. Challenge study in guinea pigs showed complete protection following vaccination using pentavalent vaccine blended with Montanide adjuvants, while the aluminium hydroxide adjuvant was able to confer only partial protection. The Montanide blended prototype vaccines were also able to prevent renal colonisation of all five serogroups. This study shows the potential of the oil adjuvant blended multivalent vaccine for use in vaccination programmes against bovine leptospirosis.
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