scholarly journals Experimental reproduction of porcine respiratory disease complex in pigs inoculated porcine reproductive and respiratory syndrome virus and Mycoplasma hyopneumoniae and followed by inoculation with porcine circovirus type 2

2021 ◽  
Author(s):  
Joo Young LEE ◽  
Kee Hwan PARK ◽  
Taehwan OH ◽  
Siyeon YANG ◽  
Jeongmin SUH ◽  
...  
Keyword(s):  
Respiratory Disease ◽  
Mycoplasma Hyopneumoniae ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus Type 2 ◽  
Porcine Circovirus ◽  
Respiratory Syndrome Virus ◽  
Experimental Reproduction ◽  
Disease Complex ◽  
Porcine Respiratory

scholarly journals Comparison of Four Commercial One-Dose Porcine Circovirus Type 2 (PCV2) Vaccines Administered to Pigs Challenged with PCV2 and Porcine Reproductive and Respiratory Syndrome Virus at 17 Weeks Postvaccination To Control Porcine Respiratory Disease Complex under Korean Field Conditions

2014 ◽  
Vol 21 (3) ◽  
pp. 399-406 ◽  
Author(s):  
Changhoon Park ◽  
Hwi Won Seo ◽  
Kiwon Han ◽  
Chanhee Chae
Keyword(s):  
Respiratory Disease ◽  
Porcine Circovirus Type ◽  
Porcine Circovirus Type 2 ◽  
Field Conditions ◽  
Porcine Circovirus ◽  
Respiratory Syndrome Virus ◽  
Disease Complex ◽  
Associated Lesions ◽  
Porcine Respiratory

ABSTRACTUnder Korean field conditions, coinfection with porcine circovirus type 2 (PCV2) and porcine reproductive and respiratory syndrome virus (PRRSV) is most commonly observed in porcine respiratory disease complex (PRDC). Despite the wide use of PCV2 vaccination, PRDC remains a serious respiratory problem. Thus, the objective of this study was to determine and compare the efficacy of 4 one-dose PCV2 vaccines on 3-week-old pigs with an experimental PCV2-PRRSV challenge at 17 weeks postvaccination. Regardless of which commercial PCV2 vaccine was used, the vaccination of piglets at 3 weeks of age was efficacious against cochallenge of PCV2 and PRRSV, on the basis of growth performance and PCV2-associated lesions. However, the inactivated chimeric PCV1-2 and the PCV2 vaccines induced higher PCV2-specific neutralizing antibody (NA) titers and PCV2-specific gamma interferon-secreting cells and lower PCV2 viremia levels than the two PCV2 subunit vaccines. The vaccination of piglets against PCV2 at 3 weeks of age was effective in reducing PCV2 viremia and PCV2-associated lesions during the finishing period, which is an age at which pigs are frequently affected by PRDC caused by coinfection with PCV2 and PRRSV under Korean field conditions.

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.

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