scholarly journals Bluetongue in Europe – the risk of animal import from restricted zones

2019 ◽  
Vol 75 (05) ◽  
pp. 6254-2019
Author(s):  
ANNA ORŁOWSKA ◽  
MARCIN SMRECZAK ◽  
JERZY ROLA
Keyword(s):  
Genetic Diversity ◽  
20Th Century ◽  
Bluetongue Virus ◽  
Viral Disease ◽  
Economic Losses ◽  
High Genetic Diversity ◽  
Key Factor ◽  
Vector Borne ◽  
Sentinel Animals ◽  
Free Status

Bluetongue (BT) is a vector-borne viral disease effecting ruminants caused by bluetongue virus (BTV), transmitted mainly by bites from midges of the genus Culicoides. Since the end of 20th century, BTV is endemic in several European countries and the disease is caused mainly by BTV-8 and BTV-4 infections. Bluetongue virus is characterized by high genetic diversity. To date, over 29 BTV serotypes have been documented, including recently discovered atypical serotypes BTV (25–27). The disease has a high economic impact as it causes economic losses due to animal mortality, reduced productivity and restrictions on the movement of animals. Several reports and numerous observations indicate the contribution of animal movements to the spread of BTV infections. Thus, bluetongue surveillance that includes testing of sentinel animals as well as virological testing of animals susceptible to BTV infection imported from restricted zones due to the presence of BTV is a key factor in maintaining a BT-free status

scholarly journals High Genetic Diversity in Flavobacterium psychrophilum Isolates from Healthy Rainbow Trout (Oncorhynchus mykiss) Farmed in the Same Watershed, Revealed by Two Typing Methods

2020 ◽  
Vol 87 (2) ◽  
Author(s):  
Ségolène Calvez ◽  
Nora Navarro-Gonzalez ◽  
Charlène Siekoula-Nguedia ◽  
Catherine Fournel ◽  
Eric Duchaud
Keyword(s):  
Genetic Diversity ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Clonal Complex ◽  
Economic Losses ◽  
High Genetic Diversity ◽  
Content Type ◽  
Flavobacterium Psychrophilum ◽  
Sequence Types ◽  
Apparently Healthy

ABSTRACT Flavobacterium psychrophilum affects salmonid health worldwide and causes economic losses. The genetic diversity of the pathogen must be considered to develop control methods. However, previous studies have reported both high and low levels of genetic diversity. The present longitudinal study aimed at assessing the genetic diversity of F. psychrophilum at a small temporal and geographic scale. Four farms located on the same watershed in France were studied. Rainbow trout (Oncorhynchus mykiss) batches were monitored, and apparently healthy individuals were sampled over 1 year. A total of 288 isolates were recovered from fish organs (gills and spleen) and eggs. Pulsed field gel electrophoresis revealed high genetic diversity. Multilocus sequence typing performed on a selection of 31 isolates provided congruent results, as follows: 18 sequence types (STs) were found, of which 13 were novel. The mean gene diversity (H = 0.8413) was much higher than that previously reported for this host species, although the sampling was restricted to a single watershed and 1 year. Seven isolates out of 31 were assigned to clonal complex ST10 (CC-ST10), which is the predominant clonal complex in the main salmonid production areas. A split decomposition tree reflected a panmictic population. This finding is important for aquaculture veterinarians in their diagnostic procedure, as the choice of adequate antibiotic treatment is conditioned by the correct identification of the causative agent. Furthermore, this study expands our knowledge on genetic diversity required for the development of an effective vaccine against F. psychrophilum. IMPORTANCE The bacterium Flavobacterium psychrophilum is a serious pathogen in many fish species, especially salmonids, that is responsible for considerable economic losses worldwide. In order to treat infections and to develop vaccines, the genetic diversity of this bacterium needs to be known. We assessed the genetic diversity of F. psychrophilum isolates from apparently healthy rainbow trout raised in several fish farms in the same watershed in France. Two different genotyping methods revealed high diversity. The majority of isolates were unrelated to clonal complex sequence type 10 (CC-ST10), the clonal complex that is predominant worldwide and associated with disease in rainbow trout. In addition, we found 13 novel sequence types. These results suggest that a diverse subpopulation of F. psychrophilum may be harbored by rainbow trout.

scholarly journals Status of Animal Health with Emphasis of Blue Tongue Virus Disease in Kalat Region, Balochistan

2019 ◽  
Vol 2 (2) ◽  
pp. 44-46
Author(s):  
Shafiq Ahmed ◽  
Muhammad Shafee ◽  
Abdul Razzaq ◽  
Muhammad Rahim Niazi ◽  
Abdul Wahid
Keyword(s):  
Virus Disease ◽  
Animal Health ◽  
Small Ruminants ◽  
Viral Disease ◽  
Easy Access ◽  
Economic Losses ◽  
High Morbidity ◽  
Vector Borne ◽  
Undiagnosed Diseases ◽  
Scattered Population

Bluetongue is non contagious vector borne viral disease of small ruminants. It transmits by biting of culicoids midges and causes severe economic losses to animal owner in term of high morbidity, decreased production and impaired reproduction. Balochistan, being largest province of the country have scattered population in far remote areas. About 70% of the provincial population rely upon livestock rearing for their livelihood. Kalat is largest division of the province that stretches from Kalat city upto Lasbella including Khuzdar, Kharan and Awaran. It is located on main RCD route that will ultimately boost the animal marketing and their easy access to main market. Although different vaccines are practiced throughout the province but no such vaccine is available against BTV in the country. That’s why animals are facing problems of some undiagnosed diseases. This review provides necessary information about disease in the region. It is need of the time to educate farmer and strict vigilance may be practiced for proper and timely vaccination of all animals to curtail deadliest diseases in the region. 

scholarly journals Genetic Diversity and Population Structure for Resistance and Susceptibility to Mastitis in Braunvieh Cattle

2021 ◽  
Vol 8 (12) ◽  
pp. 329
Author(s):  
Mitzilin Zuleica Trujano-Chavez ◽  
Reyna Sánchez-Ramos ◽  
Paulino Pérez-Rodríguez ◽  
Agustín Ruíz-Flores
Keyword(s):  
Genetic Diversity ◽  
Candidate Genes ◽  
Genetic Resistance ◽  
Principal Component ◽  
Clinical Mastitis ◽  
Snp Markers ◽  
Economic Losses ◽  
High Genetic Diversity ◽  
A Value ◽  
Candidate Loci

Mastitis is a disease that causes significant economic losses, since resistance to mastitis is a difficult trait to be improved due to its multifactorial occurrence. Therefore, our objective was to characterize a Mexican Braunvieh cattle population for genetic resistance and susceptibility to mastitis. We used 66 SNP markers for 45 candidate genes in 150 animals. The average heterozygosity was 0.445 ± 0.076, a value higher than those reported for some European breeds. The inbreeding coefficient was slightly negative for resistance to subclinical (−0.058 ± 0.055) and clinical (−0.034 ± 0.076) mastitis, possibly due to low selection for the immunological candidate genes that influence these traits. The genotypic profiles for the candidate loci per K-means group were obtained, as well as the group distribution through the graphics of the principal component analysis. The genotypic profiles showed high genetic diversity among groups. Resistance to clinical mastitis had the lowest presence of the heterozygous genotypes. Although the percentage of highly inbred animals (>50%) is up to 13.3%, there are highly heterozygous groups in terms of the studied traits, a favorable indicator of the presence of genetic diversity. The results of this study constitute evidence of the genetic potential of the Mexican Braunvieh population to improve mastitis-related traits.

scholarly journals Genetic heterogeneity of Escherichia coli isolated from pasteurized milk in State of Paraná, Brazil

2014 ◽  
Vol 50 (2) ◽  
pp. 337-343 ◽  
Author(s):  
Karine Oltramari ◽  
Rosilene Fressati Cardoso ◽  
Eliana Valéria Patussi ◽  
Adolfo Carlos Barreto Santos ◽  
Jane Martha Graton Mikcha
Keyword(s):  
Escherichia Coli ◽  
Genetic Diversity ◽  
Diarrheal Disease ◽  
Food Contamination ◽  
Economic Losses ◽  
High Morbidity ◽  
High Genetic Diversity ◽  
Pasteurized Milk ◽  
E Coli ◽  
Northwestern Region

Food contamination caused by enteric pathogens is a major cause of diarrheal disease worldwide, resulting in high morbidity and mortality and significant economic losses. Bacteria are important agents of foodborne diseases, particularly diarrheagenic Escherichia coli. The present study assessed the genetic diversity and antimicrobial resistance of E. coli isolates from pasteurized milk processed in 21 dairies in northwestern State of Parana, Brazil. The 95 E. coli isolates were subjected to antimicrobial susceptibility testing according to the recommendations of the Clinical and Laboratory Standards Institute and assessed genotypically by Enterobacterial Repetitive Intergenic Consensus-Polymerase Chain Reaction (ERIC-PCR). The highest rate of resistance was observed for cephalothin (55.78%). ERIC-PCR revealed high genetic diversity, clustering the 95 bacterial isolates into 90 different genotypic patterns. These results showed a heterogeneous population of E. coli in milk samples produced in the northwestern region of Paraná and the need for good manufacturing practices throughout the processing of pasteurized milk to reduce the risk of foodborne illnesses.

scholarly journals Comparison of Diplodia Tip Blight Pathogens in Spanish and North American Pine Ecosystems

2021 ◽  
Vol 9 (12) ◽  
pp. 2565
Author(s):  
Ana Aragonés ◽  
Tania Manzanos ◽  
Glen Stanosz ◽  
Isabel A. Munck ◽  
Rosa Raposo ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genotypic Diversity ◽  
Economic Losses ◽  
Common Disease ◽  
Sample Type ◽  
High Genetic Diversity ◽  
The North ◽  
Low Genetic Diversity ◽  
Shoot Blight ◽  
North Of Spain

Diplodia tip blight is the most ubiquitous and abundant disease in Spanish Pinus radiata plantations. The economic losses in forest stands can be very severe because of its abundance in cones and seeds together with the low genetic diversity of the host. Pinus resinosa is not genetically diverse in North America either, and Diplodia shoot blight is a common disease. Disease control may require management designs to be adapted for each region. The genetic diversity of the pathogen could be an indicator of its virulence and spreading capacity. Our objective was to understand the diversity of Diplodia spp. in Spanish plantations and to compare it with the structure of American populations to collaborate in future management guidelines. Genotypic diversity was investigated using microsatellite markers. Eight loci (SS9–SS16) were polymorphic for the 322 isolates genotyped. The results indicate that Diplodia sapinea is the most frequent Diplodia species present in plantations of the north of Spain and has high genetic diversity. The higher genetic diversity recorded in Spain in comparison to previous studies could be influenced by the intensity of the sampling and the evidence about the remarkable influence of the sample type.

scholarly journals Detection of genetic diversity of Anaplasma marginale isolates in Minas Gerais, Brazil

2013 ◽  
Vol 22 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Anna Elisabeth Pohl ◽  
Alejandro Cabezas-Cruz ◽  
Múcio Flávio Barbosa Ribeiro ◽  
Júlia Angélica Gonçalves da Silveira ◽  
Cornelia Silaghi ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Geographic Area ◽  
Minas Gerais ◽  
Surface Proteins ◽  
Economic Losses ◽  
High Genetic Diversity ◽  
Cattle Industry ◽  
Minas Gerais State ◽  
Major Surface Proteins ◽  
Major Surface

Bovine anaplasmosis, caused by the tick-borne rickettsiaAnaplasma marginale, is endemic in tropical and subtropical regions of the world and results in economic losses in the cattle industry. Major surface proteins (MSPs) have been used as markers for the genetic characterization of A. marginale strains and demonstrate that many isolates may occur in a given geographic area. However, in Brazil, little is known about the genetic diversity of A. marginale isolates within individual herds. This study was designed to examine the genetic variation among A. marginale infecting calves in a farm in the south of Minas Gerais State, Brazil. Blood samples collected from 100 calves were used to prepare Giemsastained smears that were microscopically examined for the presence of A. marginale. From each blood sample, DNA was extracted and analyzed by a polymerase chain reaction (PCR), followed by sequencing to determine diversity among the isolates. Examination of blood smears showed that 48% of the calves were infected with A. marginale, while the real-time PCR detected 70.2% positivity. Congenital infections were found in four calves. The microsatellite and tandem repeat analyses showed high genetic diversity among the isolates.

scholarly journals Genetic diversity of vector-borne pathogens in spotted and brown hyenas from Namibia and Tanzania relates to ecological conditions rather than host taxonomy

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Jürgen Krücken ◽  
Gábor Á. Czirják ◽  
Sabrina Ramünke ◽  
Maria Serocki ◽  
Sonja K. Heinrich ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Phylogenetic Analysis ◽  
Phylogenetic Analyses ◽  
Sub Saharan Africa ◽  
Anthropogenic Factors ◽  
High Genetic Diversity ◽  
Acinonyx Jubatus ◽  
Ecological Conditions ◽  
Vector Borne ◽  
Babesia Lengau

Abstract Background Improved knowledge on vector-borne pathogens in wildlife will help determine their effect on host species at the population and individual level and whether these are affected by anthropogenic factors such as global climate change and landscape changes. Here, samples from brown hyenas (Parahyaena brunnea) from Namibia (BHNA) and spotted hyenas (Crocuta crocuta) from Namibia (SHNA) and Tanzania (SHTZ) were screened for vector-borne pathogens to assess the frequency and genetic diversity of pathogens and the effect of ecological conditions and host taxonomy on this diversity. Methods Tissue samples from BHNA (n = 17), SHNA (n = 19) and SHTZ (n = 25) were analysed by PCRs targeting Anaplasmataceae, Rickettsia spp., piroplasms, specifically Babesia lengau-like piroplasms, Hepatozoidae and filarioids. After sequencing, maximum-likelihood phylogenetic analyses were conducted. Results The relative frequency of Anaplasmataceae was significantly higher in BHNA (82.4%) and SHNA (100.0%) than in SHTZ (32.0%). Only Anaplasma phagocytophilum/platys-like and Anaplasma bovis-like sequences were detected. Rickettsia raoultii was found in one BHNA and three SHTZ. This is the first report of R. raoultii from sub-Saharan Africa. Babesia lengau-like piroplasms were found in 70.6% of BHNA, 88.9% of SHNA and 32.0% of SHTZ, showing higher sequence diversity than B. lengau from South African cheetahs (Acinonyx jubatus). In one SHTZ, a Babesia vogeli-like sequence was identified. Hepatozoon felis-like parasites were identified in 64.7% of BHNA, 36.8% of SHNA and 44.0% of SHTZ. Phylogenetic analysis placed the sequences outside the major H. felis cluster originating from wild and domestic felids. Filarioids were detected in 47.1% of BHNA, 47.4% of SHNA and 36.0% of SHTZ. Phylogenetic analysis revealed high genetic diversity and suggested the presence of several undescribed species. Co-infections were frequently detected in SHNA and BHNA (BHNA median 3 pathogens, range 1–4; SHNA median 3 pathogens, range 2–4) and significantly rarer in SHTZ (median 1, range 0–4, 9 individuals uninfected). Conclusions The frequencies of all pathogens groups were high, and except for Rickettsia, multiple species and genotypes were identified for each pathogen group. Ecological conditions explained pathogen identity and diversity better than host taxonomy. Graphic Abstract

scholarly journals Genotypic analyses and virulence characterization ofGlaesserella parasuisisolates from Taiwan

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6960 ◽  
Author(s):  
Wei-Hao Lin ◽  
Hsing-Chun Shih ◽  
Chuen-Fu Lin ◽  
Cheng-Yao Yang ◽  
Chao-Nan Lin ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Partial Correlation ◽  
Economic Losses ◽  
Swine Industry ◽  
High Genetic Diversity ◽  
Molecular Serotyping ◽  
Positive Rate ◽  
Polymerase Chain ◽  
Different Strains ◽  
Group 1

BackgroundGlaesserella(Haemophilus)parasuis(G. parasuis) causes severe economic losses in the swine industry. MultipleG. parasuisstrains can exist in single animals. Typing techniques are required for identifyingG. parasuisisolates. Different strains within a serovar display varying virulence. Enterobacterial repetitive intergenic consensus polymerase chain reaction (ERIC-PCR) can assess the heterogeneity. The group 1 virulence-associated trimeric autotransporters (vtaA) gene is an indicator of virulence. The aim of this study was to characterize TaiwaneseG. parasuisisolates via molecular serotyping, vtaA PCR and ERIC-PCR.MethodsOne hundred and forty-five strains were collected between November 2013 and March 2017 in Taiwan and further examined by molecular serotyping, vtaA PCR and ERIC-PCR.ResultsThe dendrogram revealed heterogeneous genetic diversity within many clusters. Partial correlation between the ERIC-PCR clusters of different strains, serovars and lesion patterns was observed. Twelve herds (8.3%) infected with more than one strain. Group 1 vtaA positive rate reached 98.6%.DiscussionThis study showed the high genetic diversity ofG. parasuisin Taiwan by a high discriminatory capability of ERIC-PCR. Group 1 vtaA commonly exists inG. parasuisisolates and may play important roles in the pathogenesis of TaiwaneseG. parasuisisolates.

scholarly journals Risk-based surveillance for bluetongue virus in cattle on the south coast of England in 2017 and 2018

2020 ◽  
Vol 187 (11) ◽  
pp. e96-e96
Author(s):  
Katherine Elinor Felicity Grace ◽  
Christina Papadopoulou ◽  
Tobias Floyd ◽  
Rachelle Avigad ◽  
Steve Collins ◽  
...  
Keyword(s):  
Bluetongue Virus ◽  
Animal Health ◽  
Atmospheric Dispersion ◽  
Economic Loss ◽  
Viral Disease ◽  
South Coast ◽  
The South ◽  
Negative Results ◽  
The Uk ◽  
Free Status

BackgroundBluetongue (BT) is a viral disease of ruminants and camelids which can have a significant impact on animal health and welfare and cause severe economic loss. The UK has been officially free of bluetongue virus (BTV) since 2011. In 2015, BTV-8 re-emerged in France and since then BTV has been spreading throughout Europe. In response to this outbreak, risk-based active surveillance was carried out at the end of the vector seasons in 2017 and 2018 to assess the risk of incursion of BTV into Great Britain.MethodAtmospheric dispersion modelling identified counties on the south coast of England at higher risk of an incursion. Blood samples were collected from cattle in five counties based on a sample size designed to detect at least one positive if the prevalence was 5 per cent or greater, with 95 per cent confidence.ResultsNo virus was detected in the 478 samples collected from 32 farms at the end of the 2017 vector season or in the 646 samples collected from 43 farms at the end of the 2018 vector season, when tested by RT-qPCR.ConclusionThe negative results from this risk-based survey provided evidence to support the continuation of the UK’s official BTV-free status.

scholarly journals Analysis of 44 Vibrio anguillarum genomes reveals high genetic diversity

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10451
Author(s):  
Mie Johanne Hansen ◽  
Egle Kudirkiene ◽  
Inger Dalsgaard
Keyword(s):  
Genetic Diversity ◽  
Rainbow Trout ◽  
De Novo ◽  
Vibrio Anguillarum ◽  
Antibiotic Resistance Genes ◽  
Economic Losses ◽  
Nucleotide Polymorphisms ◽  
High Genetic Diversity ◽  
Pan Genome ◽  
Almost All

Vibriosis, a hemorrhagic septicemic disease caused by the bacterium Vibrio anguillarum, is an important bacterial infection in Danish sea-reared rainbow trout. Despite of vaccination, outbreaks still occur, likely because the vaccine is based on V. anguillarum strains from abroad/other hosts than rainbow trout. Information about the genetic diversity of V. anguillarum specifically in Danish rainbow trout, is required to investigate this claim. Consequently, the aim of the present investigation was to sequence and to characterize a collection of 44 V. anguillarum strains obtained primarily from vibriosis outbreaks in Danish rainbow trout. The strains were sequenced, de novo assembled, and the genomes examined for the presence of plasmids, virulence, and acquired antibiotic resistance genes. To investigate the phylogeny, single nucleotide polymorphisms were identified, and the pan-genome was calculated. All strains carried tet(34) encoding tetracycline resistance, and 36 strains also contained qnrVC6 for increased fluoroquinolone/quinolone resistance. But interestingly, all strains were phenotypic sensitive to both oxytetracycline and oxolinic acid. Almost all serotype O1 strains contained a pJM1-like plasmid and nine serotype O2A strains carried the plasmid p15. The distribution of virulence genes was rather similar across the strains, although evident variance among serotypes was observed. Most significant, almost all serotype O2 and O3 strains, as well as the serotype O1 strain without a pJM1-like plasmid, carried genes encoding piscibactin biosynthesis. Hence supporting the hypothesis, that piscibactin plays a crucial role in virulence for pathogenic strains lacking the anguibactin system. The phylogenetic analysis and pan-genome calculations revealed great diversity within V. anguillarum. Serotype O1 strains were in general very similar, whereas considerable variation was found among serotype O2A strains. The great diversity within the V. anguillarum serotype O2A genomes is most likely the reason why vaccines provide good protection from some strains, but not from others. Hopefully, the new genomic data and knowledge provided in this study might help develop an optimized vaccine against V. anguillarum in the future to reduce the use of antibiotics, minimize economic losses and improve the welfare of the fish.

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