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Fenaux M, Opriessnig T, Halbur PG, Xu Y, Potts B, Meng XJ. Detection and in vitro and in vivo characterization of porcine circovirus DNA from a porcine-derived commercial pepsin product. J Gen Virol 2004; 85:3377-3382. [PMID: 15483254 DOI: 10.1099/vir.0.80429-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Non-pathogenic porcine circovirus type 1 (PCV1) and pathogenic PCV2 are widespread in swine herds. In this study, the detection and characterization of PCV1 and PCV2 DNA from porcine-derived commercial pepsin are reported. The complete genomic sequences of the pepsin-derived PCV1 and PCV2 share 76 % nucleotide sequence identity with each other and 95–99 % identity with respective North American PCV1 and PCV2 isolates. However, the PCV-contaminated pepsin lacks infectivity in PK-15 cells. To further assess the infectivity of the contaminating pepsin in vivo, 16 5-week-old, specific-pathogen-free pigs were divided randomly into three groups: pigs in group 1 (n=5) were each inoculated intramuscularly and intranasally with 4 ml PBS buffer as negative controls, those in group 2 (n=6) were each inoculated with 400 mg contaminated pepsin dissolved in 4 ml PBS and those in group 3 (n=5) were each inoculated with 4×104·3 TCID50 PCV2 as positive controls. PCV2 viraemia, seroconversion and pathological lesions were detected in group 3 pigs, but not in group 1 or 2 pigs, confirming that the contaminating PCVs were non-infectious. Nevertheless, the detection of PCV DNA in a porcine-derived commercial product raises concern for potential human infection through xenotransplantation.
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Affiliation(s)
- M Fenaux
- Center for Molecular Medicine and Infectious Diseases, College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0342, USA
| | - T Opriessnig
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
| | - P G Halbur
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
| | - Y Xu
- Genentech Inc., 1 DNA Way, South San Francisco, CA, USA
| | - B Potts
- Genentech Inc., 1 DNA Way, South San Francisco, CA, USA
| | - X-J Meng
- Center for Molecular Medicine and Infectious Diseases, College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0342, USA
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