Molecular detection of porcine circo virus type 2 and porcine parvo virus inpigs having reproductive problems and histopathologicalstudies in the tissue of aborted pig foetuses

2016 ◽  
Author(s):  
S. R. Pegu ◽  
D. K. Sarma ◽  
S. Rajkhowa ◽  
M. Choudhury ◽  
D. Sarma ◽  
...  
Keyword(s):  
Molecular Detection ◽  
Infectious Agent ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus ◽  
Viral Pathogens ◽  
Lymphoid Depletion ◽  
Total Dna ◽  
Polymerase Chain ◽  
Kidney Liver

The present study was undertaken to detect the presence of porcine circovirus type 2 (PCV2) and porcine parvo virus (PPV) in 54 porcine aborted foetuses, stillborns and mummified foetuses. Foetal tissues of heart, lung, spleen and lymphnodes were used for extraction of total DNA and the presence of viral pathogens were confirmed through polymerase chain reaction (PCR) technique. Out of 54 samples, nine (16.6%) samples were positive for PCV2, eight (14.8%) samples were positive for PPV while co-infection with PCV2 and PPV was detected in four (7.4%) samples. The histopathological changes in the foetuses were found to be mostly necrosis in the cells of the developing organs viz. lungs, kidney, liver, heart, brain, spleen and lymphnodes. Lymphoid depletion was observed in the lymphoid follicles of the lymphnodes. Meningoencephalitis in the cerebrum was also seen in both PPV and PCV2 infected foetuses. The results indicated that PPV and PCV2 could be an important infectious agent in cases of porcine stillbirths, abortions and mummified foetuses.

Porcine circoviruses: a minuscule yet mammoth paradox

2008 ◽  
Vol 10 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Sheela Ramamoorthy ◽  
Xiang-Jin Meng
Keyword(s):  
Porcine Circovirus Type ◽  
Porcine Circovirus ◽  
Economic Losses ◽  
Weanling Pigs ◽  
Viral Pathogens ◽  
Pork Industry ◽  
The Usa ◽  
Lymphoid Depletion ◽  
Porcine Circoviruses

AbstractPorcine circovirus type 2 (PCV2) is the primary causative agent for porcine circovirus-associated disease (PCVAD). PCVAD has been the cause of considerable economic losses to the pork industry worldwide. The disease is primarily characterized by wasting, enlarged lymph nodes, jaundice and weight loss in affected weanling pigs. Several other complex syndromes involving reproductive failure, enteritis, pneumonia and necrotizing dermatitis have also been associated with PCV2 infection. Lymphoid depletion, which is the hallmark lesion of PCVAD, predisposes the host to immunosuppression. Disease progression is further complicated by co-infections with other bacterial and viral pathogens. Despite the availability of effective vaccines for the last 2 years, newly emerging strains of the virus have been reported to cause more severe outbreaks in parts of the USA and Canada. While knowledge of the biology and pathogenesis of PCV2 has progressed considerably over the last 12 years since the disease was recognized, many questions still remain to be answered.

scholarly journals Granulomatous Necrotizing Myositis in Swine Affected by Porcine Circovirus Disease

2017 ◽  
Vol 55 (2) ◽  
pp. 268-272 ◽  
Author(s):  
Guilherme Konradt ◽  
Raquel A. S. Cruz ◽  
Daniele M. Bassuino ◽  
Matheus V. Bianchi ◽  
Caroline P. de Andrade ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Clinical Signs ◽  
Giant Cells ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus ◽  
Lower Amount ◽  
Clinical Syndromes ◽  
Necrotizing Myositis ◽  
Polymerase Chain

Porcine circovirus type 2 (PCV2) is associated with multiple clinical syndromes in pigs, known as porcine circovirus diseases. This work describes an outbreak of porcine circovirus diseases with severe lesions affecting the skeletal muscle. Ninety-two pigs had apathy, weight loss, and diarrhea over a clinical course of 7 to 10 days. Approximately 30 of the pigs had stiff gait, muscle weakness, hind limb paresis, and recumbency. Twelve of the 92 pigs were necropsied, and 4 had pale discoloration of skeletal muscles with microscopic lesions of granulomatous necrotizing myositis. Immunohistochemistry of skeletal muscle showed that PCV2 antigen was located primarily in the cytoplasm and nuclei of macrophages, lymphocytes, and multinucleated giant cells, with a lower amount in the cytoplasm of endothelial cells, necrotic fibers, and satellite cells. Affected muscle samples were polymerase chain reaction–positive for PCV2 and the amplicon exhibited 99% identity with sequences belonging to the PCV2b genotype. Locomotor clinical signs and granulomatous necrotizing myositis should be considered as another expression of PCV2 infection in pigs.

scholarly journals Apoptosis in lymphoid organs of pigs naturally infected by porcine circovirus type 2

2004 ◽  
Vol 85 (10) ◽  
pp. 2837-2844 ◽  
Author(s):  
Ana R. Resendes ◽  
Natàlia Majó ◽  
Joaquim Segalés ◽  
Enric Mateu ◽  
Maria Calsamiglia ◽  
...  
Keyword(s):  
Lymph Node ◽  
Viral Load ◽  
B Cell ◽  
Inguinal Lymph Node ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus ◽  
Lymphoid Tissues ◽  
Lymphoid Depletion ◽  
Superficial Inguinal Lymph Node

The objective of the present study was to evaluate the involvement of apoptosis in the development of post-weaning multisystemic wasting syndrome (PMWS) lymphoid-depletion lesions. Twenty-one pigs that were categorized into three different lesional severity stages (S1, n=5; S2, n=7; S3, n=9) and five healthy control pigs (stage S0) were used. From all pigs, samples of thymus, spleen, tonsil, ileum and superficial inguinal lymph node were processed for histological examination, in situ hybridization for porcine circovirus type 2 (PCV2) detection and cleaved caspase-3 (CCasp3) immunohistochemistry for detection of apoptotic cells. PCV2 was quantified in serum samples by using TaqMan real-time PCR. CCasp3 labelling was measured in the different morphological compartments of all lymphoid tissues, using an automated system for quantification. Differences between each tissue compartment and lesional stage were assessed, as well as the correlation between apoptosis, lesional stage and viral load. Overall, the results indicated that the more intense the lymphoid depletion, the lower the rate of apoptosis. In the thymus, the cortex was the area where differences between PMWS-affected and control animals were more evident; it was found that all PMWS-affected pigs had significantly lower rates of apoptosis than the controls. In the secondary lymphoid organs, B-cell areas presented higher rates of apoptosis; similar apoptotic rates were found in this compartment in control and S1 pigs. In S2 and S3, B-cell areas were lost and the apoptotic pattern observed was a diffusely distributed low rate of positive cells. Significantly lower rates of apoptosis between PMWS-affected pigs and the control group were already evident in S1 for the thymus, spleen, superficial inguinal lymph node and Peyer's patches, but not for the tonsils. Apoptotic rates in lymphoid tissues were correlated inversely with viral load in serum and with severity of lesions. In conclusion, the results indicate that apoptosis is not a remarkable feature in PMWS lymphoid lesion development.

scholarly journals Porcine Circovirus Type 2 Infection Decreases the Efficacy of a Modified Live Porcine Reproductive and Respiratory Syndrome Virus Vaccine

2006 ◽  
Vol 13 (8) ◽  
pp. 923-929 ◽  
Author(s):  
T. Opriessnig ◽  
N. E. McKeown ◽  
K. L. Harmon ◽  
X. J. Meng ◽  
P. G. Halbur
Keyword(s):  
Age Groups ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus Type 2 ◽  
Pcv2 Infection ◽  
Daily Weight Gain ◽  
Porcine Circovirus ◽  
Respiratory Syndrome Virus ◽  
Live Virus ◽  
Lymphoid Depletion

ABSTRACT Porcine reproductive and respiratory syndrome virus (PRRSV)-induced pneumonia is a major problem, and vaccination is used to reduce losses associated with PRRSV. Porcine circovirus type 2 (PCV2) causes lymphoid depletion, and there is concern that this adversely affects the immune response. The objective of this study was to investigate the effect of PCV2 infection on the efficacy of modified live virus (MLV) PRRSV vaccine. Sixty-nine 2-week-old pigs were randomly assigned to one of seven groups of 9 to 10 pigs each. At 6 weeks of age, pigs in groups 4, 5, and 6 were inoculated intranasally with PCV2 ISU-40895. At 8 weeks of age, groups 3, 4, 6, and 7 were vaccinated with a PRRSV MLV vaccine. At 12 weeks of age, groups 2, 3, and 4 were challenged with PRRSV SDSU73. All pigs were necropsied 14 days after PRRSV challenge. PCV2-infected, PRRSV-vaccinated, and PRRSV-challenged pigs had significantly (P < 0.05) more-severe macroscopic lung lesions than did the PRRSV-vaccinated and PRRSV-challenged pigs that were not exposed to PCV2 prior to PRRSV vaccination. Nonvaccinated PRRSV-infected pigs had a significantly (P < 0.001) higher incidence of PRRSV antigen in lungs than did all other groups except the group infected with PCV2 prior to PRRSV vaccination and challenge. The nonvaccinated PRRSV-challenged group and the group challenged with PCV2 prior to PRRSV vaccination and challenge had significantly (P < 0.001) lower average daily weight gain than did the control and the vaccinated groups. This work suggests that PCV2 infection has an adverse effect on the development of protective immunity induced by PRRSV vaccine.

scholarly journals Survey Of Infectious Agents Associated With Porcine Respiratory Disease Complex (PRDC) In Serbian Swine Herds Using Polymerase Chain Reaction (PCR) Detection

2015 ◽  
Vol 65 (1) ◽  
pp. 79-88 ◽  
Author(s):  
SAVIĆ Božidar ◽  
RADANOVIĆ Oliver ◽  
JOVIČIĆ Dubravka ◽  
NEŠIĆ Ksenija ◽  
IVANOVIĆ Snežana ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Respiratory Disease ◽  
Respiratory Virus ◽  
Mycoplasma Hyopneumoniae ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus ◽  
Chain Reaction ◽  
Polymerase Chain ◽  
Porcine Respiratory

Abstract A retrospective study on 235 natural cases of Porcine Respiratory Disease Complex in order to determine the etiological agents, their prevalence and interrelationships was performed in Serbia. Lung tissue samples were analyzed by Polymerase Chain Reaction for the presence of Porcine circovirus type 2, Porcine reproductive and respiratory virus, Swine influenza virus, Mycoplasma hyopneumoniae, Pasteurella multocida, Actinobacillus pleuropneumoniae, Haemophilus parasuis, Streptococcus suis and Arcanobacterium pyogenes. A total of 49 different combinations of viral and bacterial pathogens were found. Five different viral and viral/Mhp co-infections were detected. Monobacterial infections were found in 150 cases and polybacterial infection was detected in 85 samples. PCV2 was the main virus detected, and Pm was the most aggressive secondary pathogen detected in PRDC. The reason for PRDC being so prevalent among Serbian pigs is most likely due to the large number of risk factors in the conventional farrow-to-finish system, compared to multi-site production systems. Therefore, measures aimed at a better control of respiratory viruses, particularly Porcine circovirus type 2 and Porcine reproductive and respiratory virus, as well as Mycoplasma hyopneumoniae infections, and adoption of rational decisions on respiratory bacterial pathogens specific therapeutic and preventive strategies at herd level, simultaneously with significant improvements on farm management should reduce the occurrence of PRDC.

scholarly journals Erratum to: First molecular detection of porcine circovirus type 2 in bovids in China

Virus Genes ◽  
2015 ◽  
Vol 52 (1) ◽  
pp. 160-160
Author(s):  
Shao-Lun Zhai ◽  
Rui-Ai Chen ◽  
Sheng-Nan Chen ◽  
Xiao-Hui Wen ◽  
Dian-Hong Lv ◽  
...  
Keyword(s):  
Molecular Detection ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus Type 2 ◽  
Porcine Circovirus
Sign in / Sign up

Export Citation Format

Share Document