Standardization of enzyme immunoassay (ELISA) for serology, detection and quantification of porcine circovirus type 2 / Padronização de ensaios imunoenzimáticos (ELISA) para sorologia, detecção e quantificação do circovírus suíno 2

AUTOR(ES)

Mariana Costa Fausto

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

07/05/2010

RESUMO

Porcine circovirus 2 (PCV-2) is the major causative agent of postweaning multisystemic wasting syndrome (PMWS) and is associated with different syndromes that affect the swine. The term PCVAD (Porcine circovirus associated diseases) was introduced in 2006 to gather many diseases. Since serological studies are essential for monitoring the virus, the aim of this study was to develop enzyme immunoassays (ELISA) for detection and titration of antibodies to PCV-2 and also for viral quantification as well as the recombinant protein capsid PCV-2 (rCAP PCV-2) in extracts of Escherichia coli. After the standardization of the technique, 29 negative serum samples in ELISA were used for determining the cutt off. The quantitative ELISA was compared with the Immunoperoxidase monolayer (IPMA), through analysis of 155 serum samples, pre-determined by IPMA, of which 125 samples were positive and 30 negative samples for antibodies to PCV-2, in ELISA. The tests showed a concordance of 98.70% confirming the high sensitivity and specificity of ELISA on the IPMA. In the quantitative assay, 20 serum samples had the title determined by ELISA and it showed a higher detection limit of antibodies than the IPMA in 18 of the 20 samples tested. To quantify the rCAP PCV-2 in extracts of E.coli, a capture ELISA was developed. Were used precipitated IgGs from polyclonal rabbit serum anti-rCap PCV-2 as capture antibody and the conjugated IgGs with peroxidases as detection antibody. A standard curve was obtained by serial dilution of rCap PCV-2 and the test showed a detection limit in the range of 0.625 to 0.0097 mg/mL, which was successfully used to quantify the protein in the extract of E.coli. Thus it is expected that this test is also applied in the quantification of future PCV-2 in field samples.

ASSUNTO(S)

circovírus suíno 2 elisa curva-padrão medicina veterinaria preventiva porcine circovirus type 2 elisa standard curve

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