Cedivac-FMD can be used according to a marker vaccine principle.
In this study, we investigated whether Cedivac-FMD, an emergency vaccine against foot-and-mouth disease (FMD), is suitable for use conjointly with a screening program intended to confirm freedom from disease in vaccinated herds based on evidence of virus replication in vaccinates. Different sets of sera were tested using the Ceditest FMDV-NS ELISA for the detection of antibodies against non-structural proteins (NSPs) of FMD virus. During a vaccine safety study, serum samples were collected from 10 calves, 10 lambs and 10 piglets following administration of a double dose and a repeat dose of high payload trivalent Cedivac-FMD vaccine. All serum samples collected both 2 weeks following the administration of a double dose as well as those collected 2 weeks after the single dose booster (given 2 weeks after the double dose) were negative in the Ceditest FMDV-NS ELISA. In a series of vaccine potency experiments, serum samples were collected from 70 vaccinated cattle prior to and following exposure to infectious, homologous FMD virus. When testing cattle sera collected 4 weeks after vaccination with a regular dose of monovalent >6 PD(50) vaccines, 1 of 70 animals tested positive in the NSP antibody ELISA. After infection with FMD virus, antibodies to NSP were detected in 59 of 70 vaccinated cattle and 27 of 28 non-vaccinated control animals within 7 days. Cedivac-FMD vaccines do not induce NSP antibodies in cattle, pigs or sheep following administration of a double dose or a repeat dose. FMD-exposed animals can be detected in a vaccinated group within 7-14 days. Because Cedivac-FMD does not induce NSP antibodies, the principle of 'marker vaccine' applies.
Animal Sciences Group, Products Division, Lelystad, The Netherlands. gilles.chenard@wur.nl
Gilles
G
Chénard
Paulus
P
Selman
Aldo
A
Dekker
D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis / Q000097:blood; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis / Q000276:immunology / Q000821:virology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005536:Foot-and-Mouth Disease / Q000175:diagnosis / Q000276:immunology / Q000821:virology*; D029544:Foot-and-Mouth Disease Virus / Q000276:immunology*; D009500:Neutralization Tests / Q000662:veterinary; D012756:Sheep; D012757:Sheep Diseases / Q000175:diagnosis / Q000276:immunology / Q000821:virology*; D013552:Swine; D013553:Swine Diseases / Q000175:diagnosis / Q000276:immunology / Q000821:virology*; D022581:Vaccines, Marker / Q000276:immunology; D017361:Viral Nonstructural Proteins / Q000276:immunology; D014765:Viral Vaccines
D000914:Antibodies, Viral; D022581:Vaccines, Marker; D017361:Viral Nonstructural Proteins; D014765:Viral Vaccines