title: A synthetic peptide containing the consensus sequence of the G-H loop region of foot-and-mouth disease virus type-O VP1 and a promiscuous T-helper epitope induces peptide-specific antibodies but fails to protect cattle against viral challenge.
abstract: A pilot study was carried out in cattle to determine the immunogenicity of a synthetic consensus peptide comprising the G-H loop region of foot-and-mouth disease virus (FMDV) type-O VP1 and a non-VP1 T-helper (Th) epitope. Cattle vaccinated intramuscularly either once (n = 5) or twice (n = 4) with 50 microg of the peptide preparation at a 21-day interval developed antibodies to the peptide as determined by ELISA with the exception of one steer that received a single dose. However, neutralizing antibody titers against FMDV type-O were modest and all animals presented with clinical FMD signs upon challenge 21 days after the last vaccination. In contrast, four of the five animals inoculated with an inactivated FMD type-O commercially prepared vaccine developed neutralizing antibodies and were fully protected against clinical disease following virus challenge 21 days post-vaccination (dpv). Nucleotide sequence comparison of the VP1 region between the challenge virus and RT-PCR products recovered from a lesion of the peptide-vaccinated animal with the highest neutralizing antibody titer 5 days post-challenge (dpc) showed no evidence for selection of a neutralization-resistant mutant. We conclude that although the synthetic peptide induced an antibody response in cattle, it failed to confer protection against FMDV challenge.
authors.affiliation: Agricultural Research Service, US Department of Agriculture, Plum Island Animal Disease Center, Greenport, NY 11944, USA. lrodriguez@piadc.ars.usda.gov
authors.forename: Luis L
authors.initials: LL
authors.lastname: Rodriguez
authors.forename: Jose
authors.initials: J
authors.lastname: Barrera
authors.forename: Ed
authors.initials: E
authors.lastname: Kramer
authors.forename: Juan
authors.initials: J
authors.lastname: Lubroth
authors.forename: Fred
authors.initials: F
authors.lastname: Brown
authors.forename: William T
authors.initials: WT
authors.lastname: Golde
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis / Q000096:biosynthesis*; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology* / Q000517:prevention & control*; D004306:Dose-Response Relationship, Immunologic; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology*; D005536:Foot-and-Mouth Disease / Q000276:immunology* / Q000517:prevention & control*; D029544:Foot-and-Mouth Disease Virus / Q000276:immunology*; D008297:Male; D008969:Molecular Sequence Data; D009500:Neutralization Tests; D010865:Pilot Projects; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D022223:Vaccines, Subunit / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D000939:Epitopes; D022223:Vaccines, Subunit; D014765:Viral Vaccines