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J. Virol., Apr 1997, 2606-2614, Vol 71, No. 4
O Taboga, C Tami, E Carrillo, JI Nunez, A Rodriguez, JC Saiz, E Blanco, ML Valero, X Roig, JA Camarero, D Andreu, MG Mateu, E Giralt, E Domingo, F Sobrino and EL Palma
A large-scale vaccination experiment involving a total of 138 cattle was
carried out to evaluate the potential of synthetic peptides as vaccines
against foot-and-mouth disease. Four types of peptides representing
sequences of foot-and-mouth disease virus (FMDV) C3 Argentina 85 were
tested: A, which includes the G-H loop of capsid protein VP1 (site A); AT,
in which a T-cell epitope has been added to site A; AC, composed of site A
and the carboxy-terminal region of VP1 (site C); and ACT, in which the
three previous capsid motifs are colinearly represented. Induction of
neutralizing antibodies, lymphoproliferation in response to viral antigens,
and protection against challenge with homologous infectious virus were
examined. None of the tested peptides, at several doses and vaccination
schedules, afforded protection above 40%. Protection showed limited
correlation with serum neutralization activity and lymphoproliferation in
response to whole virus. In 12 of 29 lesions from vaccinated cattle that
were challenged with homologous virus, mutant FMDVs with amino acid
substitutions at antigenic site A were identified. This finding suggests
the rapid generation and selection of FMDV antigenic variants in vivo. In
contrast with previous studies, this large-scale vaccination experiment
with an important FMDV host reveals considerable difficulties for vaccines
based on synthetic peptides to achieve the required levels of efficacy.
Possible modifications of the vaccine formulations to increase protective
activity are discussed.
Copyright © 1997, American Society for Microbiology
A large-scale evaluation of peptide vaccines against foot-and-mouth disease: lack of solid protection in cattle and isolation of escape mutants
Instituto de Biotecnologia, Centro de Investigacion en Ciencias Veterinarias, INTA, Buenos Aires, Argentina.
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