scholarly journals Phylogeographic analysis and identification of factors impacting the diffusion of Foot-and-Mouth disease virus in Africa

2018 ◽  
Author(s):  
Florian Duchatel ◽  
Mark Bronsvoort ◽  
Samantha Lycett
Keyword(s):  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Sub Saharan Africa ◽  
Eastern Africa ◽  
Economic Losses ◽  
Disease Epidemiology ◽  
Fmd Virus ◽  
Serotype O ◽  
Mouth Disease Virus ◽  
Foot And Mouth

ABSTRACTFoot and mouth disease (FMD) is endemic in sub-Saharan Africa and can lead to important and continuous economic losses for affected countries. Due to the complexity of the disease epidemiology and the lack of data there is a need to use inferential computational approaches to fill the gaps in our understanding of the circulation of FMD virus on this continent. Using a phylogeographic approach we reconstructed the circulation of FMD virus serotypes A, O and SAT2 in Africa and evaluated the influence of potential environmental and anthropological predictors of virus diffusion. Our results show that over the last hundred year the continental circulation of the tree serotypes was mainly driven by livestock trade. Whilst our analyses show that the serotypes A and O were introduced in Africa trough livestock trades, the SAT2 serotype probably originates from African wildlife population. The circulation of serotype O in eastern Africa is impacted by both indirect transmission through persistence in the environment and anthropological activities such as cattle movements.

scholarly journals Immunogenicity evaluation of MS2 phage-mediated chimeric nanoparticle displaying an immunodominant B cell epitope of foot-and-mouth disease virus

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4823 ◽  
Author(s):  
Guoqiang Wang ◽  
Yunchao Liu ◽  
Hua Feng ◽  
Yumei Chen ◽  
Suzhen Yang ◽  
...  
Keyword(s):  
Disease Virus ◽  
Cell Epitope ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Economic Losses ◽  
Peptide Epitopes ◽  
Serotype O ◽  
Mouth Disease Virus ◽  
Foot And Mouth

Foot-and-mouth disease (FMD) is a highly contagious disease of cloven-hoofed animals that has caused tremendous economic losses worldwide. In this study, we designed a chimeric nanoparticles (CNPs) vaccine that displays the predominant epitope of the serotype O foot-and-mouth disease virus (FMDV) VP1 131-160 on the surface of MS2 phage. The recombinant protein was expressed inEscherichia Coliand can self-assemble into CNPs with diameter at 25–30 nmin vitro. A tandem repeat peptide epitopes (TRE) was prepared as control. Mice were immunized with CNPs, TRE and commercialized synthetic peptide vaccines (PepVac), respectively. The ELISA results showed that CNPs stimulated a little higher specific antibody levels to PepVac, but was significantly higher than the TRE groups. Moreover, the results from specific IFN-γ responses and lymphocyte proliferation test indicated that CNP immunized mice exhibited significantly enhanced cellular immune response compared to TRE. These results suggested that the CNPs constructed in current study could be a potential alternative vaccine in future FMDV control.

Seroprevalence of serotype O of foot-and-mouth disease virus in vaccinated pigs and cattle in Ho Chi Minh City

2020 ◽  
pp. 21-25
Author(s):  
Chi Mai Duong
Keyword(s):  
Disease Virus ◽  
Age Groups ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Ho Chi Minh City ◽  
Post Vaccination ◽  
Fmd Virus ◽  
Serotype O ◽  
Mouth Disease Virus ◽  
Foot And Mouth

The aim of this study was to assess the seroprevalence against serotype O FMD (foot and mouth disease) virus in vaccinated pigs and cattle in Ho Chi Minh City, as a basis to serve the prevention of FMD epidemics in these animals. A total of 535 pigs and 366cattle sera were tested by using the Elisa kit for the detection of serotype O FMD antibody (Pirbright, UK). Results of this study showed that most pig farms had the proportions of positive animals for antibodies against FMDV serotype O which met the requirements of Decision no. 07/2016/ Ministry of Agriculture and Rural Development, except Xuan Thoi Thuong, Thai My and Phu My Hung. All sows had high levels of antibodies against serotype O FMD virus. There were no significant differences in the ratios of positive pigs for antibodies against FMDV serotype O among types of pig and age groups. However, there were significant differences in the seroprevalence of vaccinated pigs across herd sizes and days post-vaccination. Meanwhile, the overall seroprevalence of vaccinated cattle against FMDV at individual-level was over 80.00%. No statistical differences were found in the seroprevalence of vaccinated cattle against type OFMDV among regions, types of cattle, herd sizes, age groups and days post-vaccination. In conclusion, pigs raised in farms of Xuan Thoi Thuong, Thai My and Phu My Hung communes should be revaccinated with FMD vaccine to prevent the risk of pigs being infected with FMD virus and reduce the amount of virus produced by an infected animal.

scholarly journals Distribution of foot and mouth disease virus serotypes in cattle of Bangladesh

2017 ◽  
Vol 15 (1) ◽  
pp. 33-42 ◽  
Author(s):  
MS Islam ◽  
MA Habib ◽  
PC Saha ◽  
PM Das ◽  
MAH NA Khan
Keyword(s):  
Clinical Investigation ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Infected Cattle ◽  
Rt Pcr ◽  
Fmd Virus ◽  
Serotype O ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Time Required

Foot and mouth disease (FMD) is a highly contagious viral infection in cloven hoofed domestic and wild animals and endemic in many countries of the world including Bangladesh. Clinical investigation was carried out to identify natural cases of FMD and characteristics signs of FMD like salivation, ulceration in oral and pedal tissues and lameness was seen. The specific serotypes of FMD viruses involved in infected cattle were, therefore, identified using reverse transcriptase polymerase chain reaction (RT-PCR). Samples (N=97) from oral lesions was collected from infected cattle from seven divisions of Bangladesh during May to December, 2013. Viral RNA was extracted from the infected oral tissues and FMD virus specific uniplex RT-PCR was designed to detect FMD viruses. Multiplex RT-PCR was adapted to detect serotype specific amplicons. Out of 97 samples tested in uniplex and multiplex RT-PCR, 92 and 90 samples showed amplification reaction for FMD virus and viral serotypes respectively. Among the 90 FMD virus specific positive identification, single infectivity due to FMD viral Serotypes O, A and Asia 1 were seen in 56 (62.2%), 13 (14.4%) and 16 (17.8%) cases respectively. Three cattle (3.3%) were co-infected with FMD viral Serotypes O and Asia 1 and two (2.2%) with FMD viral Serotypes O and A. FMD viral serotype O was dominating all over the country followed by Asia1 and A. Cattle of Bangladesh were infected with FMD viral serotype O, A and Asia 1 alone or in combination. The RT-PCR protocols designed and adapted successfully detected FMD viruses and viral serotypes in a fraction of the time required for virus isolation and serological detection. These RT-PCR protocols can be used for rapid serotyping of FMD viruses from filed infectivity and selection of vaccine viruses.SAARC J. Agri., 15(1): 33-42 (2017)

Antiviral potential of ivermectin against foot-and-mouth disease virus, serotype O, A and Asia-1

2021 ◽  
pp. 104914
Author(s):  
Zahra Naeem ◽  
Sohail Raza ◽  
Saba Afzal ◽  
Ali Ahmad Sheikh ◽  
Muhammad Muddassir Ali ◽  
...  
Keyword(s):  
Disease Virus ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Serotype O ◽  
Mouth Disease Virus ◽  
Virus Serotype ◽  
Foot And Mouth

scholarly journals Novel antibody binding determinants on the capsid surface of serotype O foot-and-mouth disease virus

2014 ◽  
Vol 95 (5) ◽  
pp. 1104-1116 ◽  
Author(s):  
Amin S. Asfor ◽  
Sasmita Upadhyaya ◽  
Nick J. Knowles ◽  
Donald P. King ◽  
David J. Paton ◽  
...  
Keyword(s):  
Amino Acid ◽  
Guinea Pig ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Amino Acid Residues ◽  
Serotype O ◽  
Antigenic Sites ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
The Impact

Five neutralizing antigenic sites have been described for serotype O foot-and-mouth disease viruses (FMDV) based on monoclonal antibody (mAb) escape mutant studies. However, a mutant virus selected to escape neutralization of mAb binding at all five sites was previously shown to confer complete cross-protection with the parental virus in guinea pig challenge studies, suggesting that amino acid residues outside the mAb binding sites contribute to antibody-mediated in vivo neutralization of FMDV. Comparison of the ability of bovine antisera to neutralize a panel of serotype O FMDV identified three novel putative sites at VP2-74, VP2-191 and VP3-85, where amino acid substitutions correlated with changes in sero-reactivity. The impact of these positions was tested using site-directed mutagenesis to effect substitutions at critical amino acid residues within an infectious copy of FMDV O1 Kaufbeuren (O1K). Recovered viruses containing additional mutations at VP2-74 and VP2-191 exhibited greater resistance to neutralization with both O1K guinea pig and O BFS bovine antisera than a virus that was engineered to include only mutations at the five known antigenic sites. The changes at VP2-74 and VP3-85 are adjacent to critical amino acids that define antigenic sites 2 and 4, respectively. However VP2-191 (17 Å away from VP2-72), located at the threefold axis and more distant from previously identified antigenic sites, exhibited the most profound effect. These findings extend our knowledge of the surface features of the FMDV capsid known to elicit neutralizing antibodies, and will improve our strategies for vaccine strain selection and rational vaccine design.

scholarly journals Structural and molecular basis for foot-and-mouth disease virus neutralization by two potent protective antibodies

2021 ◽  
Author(s):  
Hu Dong ◽  
Pan Liu ◽  
Manyuan Bai ◽  
Kang Wang ◽  
Rui Feng ◽  
...  
Keyword(s):  
Neutralizing Antibodies ◽  
Protective Efficacy ◽  
Foot And Mouth Disease ◽  
Therapeutic Benefit ◽  
Mouth Disease ◽  
Economic Losses ◽  
Viral Particles ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Protective Antibodies

Outbreaks of Foot-and-mouth disease (FMD) caused by FMD virus result in significant economic losses. Vaccination is helpful, but the benefits are diminished with antigenic diversity within serotypes, instability of the immunogen and inability to confer protection for long durations. Here we have further dissected the mechanisms underpinning the protective efficacy of two previously reported neutralizing antibodies (NAbs), M8 and M170. The atomic details of the epitopes of M8 and M170 unveiled suggest that protection is conferred by disrupting the virus-receptor interactions. Consequently, administration of these NAbs conferred prophylactic and therapeutic benefit in guinea pigs, raising the possibility of administering NAbs before or during vaccination to confer immediate protection; well before the bolstering of the immune response by the vaccine. Differences in the residues and the conformation of elements making up the epitopes explain the differences in specificities of M8 and M170. An ability to bind 146S viral particles specifically, but not 12S degraded components, highlights a likely role for M170 in the quality control of vaccines.

scholarly journals Foot-and-mouth disease virus non-structural protein 3A modulates cellular innate immune responses to influence host tropism

2020 ◽  
Vol 2 (7A) ◽  
Author(s):  
Soumendu Chakravarti ◽  
Caroline Wright ◽  
Emma Howes ◽  
Richard Kock ◽  
Terry Jackson ◽  
...  
Keyword(s):  
Disease Virus ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Economic Losses ◽  
Structural Protein ◽  
Host Tropism ◽  
C Terminus ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Species Specific

The picornavirus foot-and-mouth disease virus (FMDV) is responsible for one of the most significant diseases of livestock, leading to large economic losses due to reduced productivity and trade embargoes for areas not certified as disease-free. The picornavirus non-structural protein 3A is involved in replication of the viral RNA genome and is implicated in host tropism of several picornaviruses. Deletions in the C-terminus of 3A have been observed in FMDV outbreaks specific for swine and such viruses are non-pathogenic in cattle. The mechanism for species specific attenuation of FMDV is unknown. We have shown that FMDV containing a C-terminal deletion in 3A is attenuated in bovine cell culture and that the attenuated phenotype can be reversed by the JAK1/2 inhibitor Ruxolitinib (Rux), identifying a role for the induction of interferon stimulated genes (ISGs) in the restricted bovine tropism of the 3A-deleted virus.

scholarly journals Study of the genetic heterogeneity of SAT-2 foot-and-mouth disease virus in sub-Saharan Africa with specific focus on East Africa

2007 ◽  
Vol 74 (4) ◽  
Author(s):  
M. Sahle ◽  
R.M. Dwarka ◽  
E.H. Venter ◽  
W. Vosloo
Keyword(s):  
East Africa ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Sub Saharan Africa ◽  
Gene Encoding ◽  
Western Africa ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Sub Saharan ◽  
Unrelated Strain

The epidemiology of serotype SAT-2 foot-and-mouth disease was investigated in sub-Saharan Africa by phylogenetic analysis using the 1D gene encoding the major antigenic determinant. Fourteen genotypes were identified of which three are novel and belong to East Africa, bringing the total number of genotypes for that region to eight. The genotypes clustered into three lineages that demonstrated surprising links between East, southern and south-western Africa. One lineage was unique to West Africa. These results established numerous incursions across country borders in East Africa and long term conservation of sequences for periods up to 41 years. Ethiopia, Kenya and Uganda have all experienced outbreaks from more than one unrelated strain, demonstrating the potential for new introductions. The amount of variation observed within this serotype nearly equalled that which was found between serotypes; this has severe implications for disease control using vaccination.

scholarly journals Predicting antigenic sites on the foot-and-mouth disease virus capsid of the South African Territories types using virus neutralization data

2011 ◽  
Vol 92 (10) ◽  
pp. 2297-2309 ◽  
Author(s):  
F. F. Maree ◽  
B. Blignaut ◽  
J. J. Esterhuysen ◽  
T. A. P. de Beer ◽  
J. Theron ◽  
...  
Keyword(s):  
South African ◽  
Disease Virus ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Sub Saharan Africa ◽  
Antigenic Sites ◽  
Mouth Disease Virus ◽  
Virus Serotype ◽  
Antigenic Properties ◽  
Foot And Mouth

Foot-and-mouth disease virus (FMDV) outer capsid proteins 1B, 1C and 1D contribute to the virus serotype distribution and antigenic variants that exist within each of the seven serotypes. This study presents phylogenetic, genetic and antigenic analyses of South African Territories (SAT) serotypes prevalent in sub-Saharan Africa. Here, we show that the high levels of genetic diversity in the P1-coding region within the SAT serotypes are reflected in the antigenic properties of these viruses and therefore have implications for the selection of vaccine strains that would provide the best vaccine match against emerging viruses. Interestingly, although SAT1 and SAT2 viruses displayed similar genetic variation within each serotype (32 % variable amino acids), antigenic disparity, as measured by r1-values, was less pronounced for SAT1 viruses compared with SAT2 viruses within our dataset, emphasizing the high antigenic variation within the SAT2 serotype. Furthermore, we combined amino acid variation and the r1-values with crystallographic structural data and were able to predict areas on the surface of the FMD virion as antigenically relevant. These sites were mostly consistent with antigenic sites previously determined for types A, O and C using mAbs and escape mutant studies. Our methodology offers a quick alternative to determine antigenic relevant sites for FMDV field strains.

scholarly journals Rapid Engineering of Foot-and-Mouth Disease Vaccine and Challenge Viruses

2017 ◽  
Vol 91 (16) ◽  
Author(s):  
Seo-Yong Lee ◽  
Yeo-Joo Lee ◽  
Rae-Hyung Kim ◽  
Jeong-Nam Park ◽  
Min-Eun Park ◽  
...  
Keyword(s):  
Vaccine Strain ◽  
Antigenic Variation ◽  
Foot And Mouth Disease ◽  
Vaccine Virus ◽  
Mouth Disease ◽  
Economic Losses ◽  
Gene Encoding ◽  
Virus Challenge ◽  
Mouth Disease Virus ◽  
Foot And Mouth

ABSTRACT There are seven antigenically distinct serotypes of foot-and-mouth disease virus (FMDV), each of which has intratypic variants. In the present study, we have developed methods to efficiently generate promising vaccines against seven serotypes or subtypes. The capsid-encoding gene (P1) of the vaccine strain O1/Manisa/Turkey/69 was replaced with the amplified or synthetic genes from the O, A, Asia1, C, SAT1, SAT2, and SAT3 serotypes. Viruses of the seven serotype were rescued successfully. Each chimeric FMDV with a replacement of P1 showed serotype-specific antigenicity and varied in terms of pathogenesis in pigs and mice. Vaccination of pigs with an experimental trivalent vaccine containing the inactivated recombinants based on the main serotypes O, A, and Asia1 effectively protected them from virus challenge. This technology could be a potential strategy for a customized vaccine with challenge tools to protect against epizootic disease caused by specific serotypes or subtypes of FMDV. IMPORTANCE Foot-and-mouth disease (FMD) virus (FMDV) causes significant economic losses. For vaccine preparation, the selection of vaccine strains was complicated by high antigenic variation. In the present study, we suggested an effective strategy to rapidly prepare and evaluate mass-produced customized vaccines against epidemic strains. The P1 gene encoding the structural proteins of the well-known vaccine virus was replaced by the synthetic or amplified genes of viruses of seven representative serotypes. These chimeric viruses generally replicated readily in cell culture and had a particle size similar to that of the original vaccine strain. Their antigenicity mirrored that of the original serotype from which their P1 gene was derived. Animal infection experiments revealed that the recombinants varied in terms of pathogenicity. This strategy will be a useful tool for rapidly generating customized FMD vaccines or challenge viruses for all serotypes, especially for FMD-free countries, which have prohibited the import of FMDVs.

Sign in / Sign up

Export Citation Format

Share Document