title: The long term effect of age and maternally derived antibodies against foot and mouth disease on the serological response following vaccination in young dairy calves.
abstract: In Israel, occurrence of foot and mouth disease (FMD) in dairy farms is rare. However, when FMD outbreaks occur, dairy calves are the most affected, despite routine vaccination. Contradictory findings exist regarding the effect of age and maternally derived antibodies (MDA) on the serological response following vaccinations against FMD in dairy calves. Furthermore, the long term effect of FMD vaccination regimen during early life was rarely assessed. This study was conducted in order to assess both the short and long term effects. In total 44 non-vaccinated calves were divided into four groups of different age. Calves were vaccinated up to four times and 484 serum samples were collected on 11 time points in a period of 70weeks. Virus neutralizing tests were performed in order to determine the neutralizing antibody titers (NAT) against the vaccine strains (homologous serotypes): O-4625, O-Manisa, ASIA-1-Shamir and the heterologous serotype A-Turkey-20/2006. A similar NAT pattern was observed to all serotypes and therefore statistical analysis was restricted to O-4625 serotype. The MDA titer was negatively associated with the age of the calves and the MDA half-life was 22days. We demonstrated that early vaccination of calves (younger than three months) resulted in low NAT, even after four repeated vaccinations, compared with vaccination of calves older than three months. The percentage of time in which these calves had a NAT above 2.0 (log10) between the age of six months and 1.5years was significantly lower compared to older calves (older than three months). Additionally, we found that by increasing the frequency of vaccination in calves older than three months, it is possible to reach high NAT by the age of one year. Adoption of such a vaccination regimen in Israel as well as other FMD endemic countries may allow better protection against FMD in dairy calves and reduction in FMD incidence.
authors: Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, POB 12, Rehovot 76100, Israel.
authors: Ehud
authors: E
authors: Elnekave
authors: Central Veterinary Institute, Part of Wageningen UR, Lelystad, The Netherlands.
authors: Aldo
authors: A
authors: Dekker
authors: Central Veterinary Institute, Part of Wageningen UR, Lelystad, The Netherlands.
authors: Phaedra
authors: P
authors: Eble
authors: Central Veterinary Institute, Part of Wageningen UR, Lelystad, The Netherlands.
authors: Froukje
authors: F
authors: van Hemert-Kluitenberg
authors: Kimron Veterinary Institute, Beit Dagan, Israel.
authors: Boris
authors: B
authors: Gelman
authors: Kimron Veterinary Institute, Beit Dagan, Israel.
authors: Nick
authors: N
authors: Storm
authors: Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, POB 12, Rehovot 76100, Israel. Electronic address: eyal.klement@gmail.com.
authors: Eyal
authors: E
authors: Klement
mesh_terms: D000818:Animals; D057134:Antibodies, Neutralizing / Q000097:blood; D000914:Antibodies, Viral / Q000097:blood; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D005536:Foot-and-Mouth Disease / Q000517:prevention & control*; D007112:Immunity, Maternally-Acquired; D007115:Immunization Schedule; D007557:Israel; D014611:Vaccination; D014765:Viral Vaccines / Q000627:therapeutic use*
chemical_list: D057134:Antibodies, Neutralizing; D000914:Antibodies, Viral; D014765:Viral Vaccines
keywords: Calves; Dairy; FMD; Maternally derived antibodies (MDA); Neutralization antibody titers (NAT); Serology