Antigenic Profiling and Genetic Analysis of Foot-and-Mouth Disease Virus in Uganda
Foreign Animal Disease Research
2013 Annual Report
1a.Objectives (from AD-416):
This collaborative research project between ARS, PIADC and Makerere University in Uganda seeks to examine the genetic composition and antigenic relationship of Foot-and-Mouth Disease Virus (FMDV) in the FMD endemic region of Africa. Viral characterization of the serotypes currently circulating in the region will be conducted in order to perform effective vaccine matching.
1b.Approach (from AD-416):
To characterize Foot-and-Mouth Disease Virus (FMDV) isolates, samples will be collected and titrated using serotype-specific solid phase blocking enzyme linked immunosorbent assay (ELISAs) and by virus neutralization assays (VNTs). The vaccine matching approach will include the genetical characterization of the isolated viruses followed by determining antigenic relatedness of the viruses to known or putative new vaccine strains used in Uganda. Genetic diversity of the isolates will be determined by nucleotide sequencing of the capsid-coding region of FMDV. The outer capsid-coding sequence of FMDV will allow the prediction of antigenic relatedness to known or potential new vaccine strains and also the verification of serotypes. Serological antigenic matching tests will be carried out for the isolates against putative and known vaccine strains. Antisera will be prepared against putative vaccine strains. Where appropriate, currently used vaccine strains will be included in the test. In addition effort will be placed in developing capacity of performing VNT’s at Makerere University. Molecular and biochemical approaches like this are needed to address some of the limitations in the performance of current vaccines, in particular to their coverage. The implementation of these methodologies should contribute to the progressive global control and eradication of this devastating disease.
This collaboration seeks to provide information about the epidemiology of Foot-and-Mouth Disease (FMD) in Uganda through improved surveillance, detection and characterization of strains circulating in the region. In addition, this collaboration seeks to identify the genetic composition of Foot-and-Mouth Disease Virus (FMDV) genome of those isolates and determine the antigenic relationship to reference FMDV strains for use in an eradication program in Uganda.
FMDV suspect samples from nine outbreak areas/districts in Uganda have been collected and stored for future analysis; inclusive of 433 sera and 72 probang/swabs and 48 tissues. Supplies and materials have been procured to conduct sample analysis.
No technologies have been transferred in FY 2013. There are no publications for this reporting period.