scholarly journals Evaluation of the Antigenic Relationships among Canine Parvovirus Type 2 Variants

2007 ◽  
Vol 15 (3) ◽  
pp. 534-539 ◽  
Author(s):  
Alessandra Cavalli ◽  
Vito Martella ◽  
Costantina Desario ◽  
Michele Camero ◽  
Anna Lucia Bellacicco ◽  
...  
Keyword(s):  
Vaccine Efficacy ◽  
Hemagglutination Inhibition ◽  
Canine Parvovirus ◽  
Immune Pressure ◽  
Homologous Virus ◽  
Canine Population ◽  
Antigenic Relationships ◽  
Canine Parvovirus Type 2 ◽  
Selection Of

ABSTRACT The antigenic relationships among the original canine parvovirus type 2 (CPV-2) and the variants CPV-2a, -2b, and -2c were evaluated. Cross-antigenic evaluation revealed clear differences among the CPV variants, which were more appreciable by serum neutralization (SN) than by hemagglutination inhibition. Antigenic differences were found mostly between the original CPV-2 and the variants, but they were also observed among the variants CPV-2a, -2b, and -2c. The variant CPV-2c exhibited a unique antigenic pattern, since it was poorly recognized by the sera of animals immunized with CPV-2, CPV-2a, and CPV-2b. However, animals immunized with CPV-2c exhibited higher SN titers to CPV-2b than to the homologous virus CPV-2c. The observed antigenic differences might drive selection of CPV strains by generating differential immune pressure in the canine population, which raises concerns about vaccine efficacy.

scholarly journals Molecular characterisation and genetic diversity of canine parvovirus type 2 prevalent in Central China

2020 ◽  
Vol 64 (3) ◽  
pp. 347-354 ◽  
Author(s):  
Wen Hu ◽  
Xin Xu ◽  
Qiang Liu ◽  
Jun Ji ◽  
Yunchao Kan ◽  
...  
Keyword(s):  
Structural Model ◽  
Canine Parvovirus ◽  
Central China ◽  
Clinical Samples ◽  
The Common ◽  
Wild Dogs ◽  
Canine Parvovirus Type 2 ◽  
Reference Strains ◽  
Selection Of

AbstractIntroductionCanine parvovirus (CPV) disease is one of the most threatening to domestic and wild dogs.Material and MethodsA total of 132 clinical samples were isolated from domestic dogs with diarrhoea from Henan, Hubei, Jiangsu, and Anhui provinces from 2016 to 2017, and 56 were positive for CPV-2 by PCR. A phylogenetic tree was constructed for the isolate sequences incorporating 53 non-Chinese reference strains.ResultsVP2 sequences showed the strains mainly to be new CPV-2a/2b and CPV-2c genotypes. The Ala5Gly, Phe267Tyr, Ser297Ala, Tyr324Ile, Gln370Arg, Asn426Asp or Asn426Glu, and Thr440Ala sites in the VP2 protein antigenic region were found to have high mutation rates. The VP2 tertiary structural model shows that the change at these mutation points is a factor for the changes in the protein structure. Significant differences between the Central Chinese strains and others were found, indicating that evolution is geographically related and extended in major regions. The homology between the identified strains confirmed their relationship. Phylogenetic analysis indicated that the common genotypes in the same clusters differ slightly in homology and evolutionary history.ConclusionThis epidemiological study enriches the available data and serves as an important reference for studies on the evolution of CPV and selection of vaccines in China.

scholarly journals Canine Parvovirus (CPV) Vaccination: Comparison of Neutralizing Antibody Responses in Pups after Inoculation with CPV2 or CPV2b Modified Live Virus Vaccine

2001 ◽  
Vol 8 (3) ◽  
pp. 612-615 ◽  
Author(s):  
Annamaria Pratelli ◽  
Alessandra Cavalli ◽  
Vito Martella ◽  
Maria Tempesta ◽  
Nicola Decaro ◽  
...  
Keyword(s):  
Immune Status ◽  
Neutralizing Antibody ◽  
Canine Parvovirus ◽  
Live Virus ◽  
Live Virus Vaccine ◽  
Homologous Virus ◽  
Antibody Titers ◽  
Heterologous Virus ◽  
Canine Parvovirus Type 2

ABSTRACT Canine parvovirus type 2 (CPV2) emerged in 1978 as causative agent of a new disease of dogs. New antigenic variants (biotypes), designated CPV2a and CPV2b, became widespread during 1979 to 1980 and 1984, respectively. At the present time the original CPV2 has disappeared in the dog population and has been replaced by the two new viruses. In the present study the comparison of neutralizing antibody titers in two groups of pups (18 pups in each group) inoculated with CPV2 and CPV2b modified live virus vaccines is reported. Using the hemagglutination inhibition (HI) test, relevant differences between antibody titers, against either the homologous or the heterologous virus, were not constantly observed. Using the neutralization (Nt) test, however, the pups inoculated with CPV2 had antibody titers which were approximately 30 times higher to the homologous virus (mean, 4,732) than to the heterologous virus (CPV2b) (mean, 162). The results of these experiments support two conclusions: (i) the HI test may not always accurately evaluate the true immune status of dogs with respect to CPV, and (ii) dogs inoculated with CPV2 vaccine develop relatively low Nt antibody titers against the heterologous virus (CPV2b). These data may suggest an advantage for new vaccines, considering that most presently licensed vaccines are produced with CPV2, which no longer exists in the dog population.

scholarly journals Investigation on Canine parvovirus circulation in dogs from Sicily (Italy) by biomolecular assay

2018 ◽  
Vol 68 (1) ◽  
pp. 80-94 ◽  
Author(s):  
Purpari Giuseppa ◽  
Mira Francesco ◽  
Di Bella Santina ◽  
Di Pietro Simona ◽  
Giudice Elisabetta ◽  
...  
Keyword(s):  
Field Isolate ◽  
Canine Parvovirus ◽  
Vp2 Gene ◽  
Worldwide Distribution ◽  
High Prevalence ◽  
Canine Population ◽  
Close Relationship ◽  
Polymerase Chain ◽  
Canine Parvovirus Type 2

Abstract Canine parvovirus type-2 (CPV-2) is a DNA virus that causes a very common worldwide diffused infectious disease in dogs. Since its appearance, the CPV-2 evolved generating novel genetic and antigenic variants (CPV-2a/2b/2c) which are distributed throughout the world. In the present study, the frequency of CPV-2 in a canine population in Sicily (Italy) was investigated, using a polymerase chain reaction (PCR) for a fragment of the VP2 gene. Out of a total of 673 samples from 370 dogs, submitted to the laboratory from July 2009 to August 2015, 265 samples (39.38%) were positive and these were further analyzed by restriction fragment length polymorphism (RFLP) and DNA sequence analysis. A high prevalence of the CPV-2c variant (79.56% of CPV-2 positive dogs) was observed in this survey, underlining that this type of CPV field isolate is prevalent circulating in Sicily. Sequence and phylogenetic analysis showed a close relationship with CPV-2a and CPV-2c strains from Europe and non-European countries. Considering that CPV-2c is reaching a worldwide distribution and that this variant is also affecting vaccinated dogs, efforts should be made towards the development of new CPV vaccines.

scholarly journals Risk and Environmental Factors Associated with the Presence of Canine Parvovirus Type 2 in Diarrheic Dogs from Thessaly, Central Greece

Pathogens ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 590
Author(s):  
Maria Kantere ◽  
Labrini V. Athanasiou ◽  
Alexios Giannakopoulos ◽  
Vassilis Skampardonis ◽  
Marina Sofia ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Clinical Symptoms ◽  
Gastrointestinal Disease ◽  
Environmental Parameters ◽  
Canine Parvovirus ◽  
Geographical Information ◽  
Factors Associated ◽  
Working Dogs ◽  
Canine Parvovirus Type 2

Canine parvovirus type 2 (CPV-2) primarily infects dogs, which are the main host reservoir, causing severe gastrointestinal disease associated with immunosuppression. The present study was conducted in Thessaly, Greece and aimed to identify risk and environmental factors associated with CPV-2 infection in diarrheic dogs. Fecal samples were collected from 116 dogs presenting diarrhea and were tested by polymerase chain reaction (PCR) for the presence of CPV-2 DNA. Supplementary data regarding clinical symptoms, individual features, management factors and medical history were also gathered for each animal during clinical evaluation. Sixty-eight diarrheic dogs were found to be positive for the virus DNA in their feces. Statistical analysis revealed that CPV-2 DNA was less likely to be detected in senior dogs, while working dogs, namely hounds and shepherds, had higher odds to be positive for the virus. Livestock density and land uses, specifically the categories of discontinuous urban fabric and of human population density, were identified as significant environmental parameters associated with CPV-2 infection by using Geographical Information System (GIS) together with the Ecological Niche Model (ENM). This is the first description of the environmental variables associated with the presence of CPV-2 DNA in dogs’ feces in Greece.

Isolation of a virus related to canine parvovirus type 2 from a raccoon (Procyon lotor)

2010 ◽  
Vol 166 (1) ◽  
pp. 24-25 ◽  
Author(s):  
S. Kapil ◽  
G. Rezabek ◽  
B. Germany ◽  
L. Johnston
Keyword(s):  
Procyon Lotor ◽  
Canine Parvovirus ◽  
Canine Parvovirus Type 2

scholarly journals Localization of the VP2 Protein of Canine Parvovirus Type 2 on the Baculovirus Envelop and Its Immunogenicity in a Mouse Model

2012 ◽  
Vol 02 (04) ◽  
pp. 178-185 ◽  
Author(s):  
Chih H. Tsai ◽  
Jing Y. Wang ◽  
Xin G. Xu ◽  
De W. Tong ◽  
Hsin Y. Lu ◽  
...  
Keyword(s):  
Mouse Model ◽  
Canine Parvovirus ◽  
Vp2 Protein ◽  
Canine Parvovirus Type 2

scholarly journals Genetic characterisation and local genotypes of canine parvovirus strains collected from pet dogs in central and eastern China during 2018–2019

2020 ◽  
Vol 64 (4) ◽  
pp. 477-486
Author(s):  
Wen Hu ◽  
Liangyan Zheng ◽  
Xin Xu ◽  
Qiang Liu ◽  
Jun Ji ◽  
...  
Keyword(s):  
Eastern China ◽  
Canine Parvovirus ◽  
Zhejiang Province ◽  
Central China ◽  
High Morbidity ◽  
Faecal Samples ◽  
Amino Acid Mutations ◽  
Canine Parvovirus Type 2 ◽  
Major Amino Acid

AbstractIntroductionCanine parvovirus type-2 (CPV-2) causes acute infectious diseases in puppies, which show high morbidity and mortality. Better effect of vaccination against these diseases could be achieved with deeper knowledge of CPV-2 genotype dissemination and mutation history. This study investigated CPV-2–positive samples collected recently over a wide region of China.Material and MethodsA total of 118 faecal samples from dogs identified as CPV-positive were collected from veterinary clinics in central and eastern China. Overall, 16 strains collected from Anhui, 29 from Henan, and 16 from Zhejiang Province were sequenced to determine the genotypic composition of CPV-2 and mutational complexity of CPV-VP2.ResultsThe CPV-2a, CPV-2b, and CPV-2c genotypes were detected in Anhui and Henan Provinces, while CPV-2c alone was detected in Zhejiang Province. Sequence analysis of all strains showed 98.5%–99.8%, 98.3%–99.9%, and 98.7%–99.8% identity among the 16 Anhui, 29 Henan, and 16 Zhejiang strains, respectively. Strains collected from Anhui and Henan Provinces showed lower identity (97.0%), suggesting greater genetic divergence in central China. The mutation rates of Henan and Anhui strains were lower than that of Zhejiang strains. Major amino acid mutations occurred at sites 5, 370, 426, and 440. Epitope and entropy analyses implied these sites’ likely conformance to the principles of mutation tendency, complexity, and diversity.ConclusionThe findings for the evolutionary structure of CPV-2 strains collected from three provinces in central and eastern China advance trend monitoring of the genetic variation in canine parvovirus and point to its implications in the development of novel vaccines.

scholarly journals A phylogenetic study of canine parvovirus type 2c in midwestern Brazil

2013 ◽  
Vol 33 (2) ◽  
pp. 214-218 ◽  
Author(s):  
Danúbia S. Fontana ◽  
Paulo Ricardo D. Rocha ◽  
Raquel A.S. Cruz ◽  
Letícya L. Lopes ◽  
Andréia L.T. Melo ◽  
...  
Keyword(s):  
Amino Acid ◽  
Genetic Variability ◽  
Dna Sequencing ◽  
Canine Parvovirus ◽  
Phylogenetic Study ◽  
Vp2 Gene ◽  
Hemorrhagic Enteritis ◽  
Canine Parvovirus Type 2 ◽  
Representative Samples

Since the late 1970s, canine parvovirus type 2 (CPV-2) has emerged as a causative agent of fatal severe acute hemorrhagic enteritis in dogs. To date, three antigenic types of CPV-2 were described worldwide (CPV-2a/b/c). This study was conducted to determine the variants of CPV-2 circulating in dogs from the Cuiabá Municipality in Midwestern Brazil. Out of 50 fecal samples, collected between 2009 and 2011, 27 tested positive for CPV-2. A 583 bp fragment of the VP2 gene was amplified by PCR, 13 representative samples were analyzed further by DNA sequencing. All strains were characterized as CPV-2c, displayed a low genetic variability although observed several amino acid substitution. These findings indicated that CPV-2c has been circulating in dogs from the Cuiabá Municipality in Midwestern Brazil.

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