Recombinant vaccines against ovine footrot.

Abstract:

:For the past 20 years footrot vaccines have evolved from simple bacterins to highly specific recombinant DNA (rDNA) fimbrial vaccines. The development of these vaccines has left a trail of discoveries, challenges and solutions; these processes continue as we move closer to understanding the requirements of a footrot vaccine. The initial whole cell vaccines were unsuccessful due to the short duration of immunity and incorporation of limited serotypes. A multistrain vaccine eliminated the problem of serotype inclusion, although the duration of immunity in many cases is still inadequate. The proteases of Dichelobacter nodosus appear to be cross protective; however, little is known of their ability to protect sheep against footrot. The major protective immunogen is the bacterial fimbriae, which also forms the basis for the K-agglutination serotyping system. K-agglutinin titre correlates directly with resistance to challenge. The protective fimbrial epitope is conformationally dependent, suggesting little advantage in the development of synthetic peptide vaccines. To enhance the efficiency of vaccine production D. nodosus fimbrial genes were eventually cloned and successfully expressed in Ps. aeruginosa. Monovalent vaccines based on recombinant fimbriae are omnipotent, inducing high levels of agglutinins and long lasting immunity. In multivalent vaccines, on the other hand, incorporation of each additional serogroup into the vaccine results in reduced efficacy both in terms of reduced K-agglutinin titres and reduced protection following challenge. The least effective are multivalent formulations representing all major serogroups. In addition, considerable genetic variation has been observed in the ability of sheep to respond optimally to each serogroup in a multivalent vaccine. Results show that the limitation of the sheep to mount an effective immune response, rather than the quality or quantity of the immunogen, limits the efficacy of current footrot vaccines. Studies are being undertaken to examine in detail the immune response of sheep to potentially highly effective footrot vaccines.

journal_name

Immunol Cell Biol

authors

O'Meara TJ,Egerton JR,Raadsma HW

doi

10.1038/icb.1993.53

subject

Has Abstract

pub_date

1993-10-01 00:00:00

pages

473-88

eissn

0818-9641

issn

1440-1711

journal_volume

71 ( Pt 5)

pub_type

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