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J Virol Methods. 2009 Sep;160(1-2):178-84. doi: 10.1016/j.jviromet.2009.04.034. Epub 2009 May 7.

Development and validation of an immunogold chromatographic test for on-farm detection of PRRSV.

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Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin, China.


An immunochromatographic test strip was developed to detect porcine reproductive and respiratory syndrome virus (PRRSV). The test uses two gold-labeled monoclonal antibodies: D5 against recombinant nucleocapsid protein (rN) and E9 against recombinant M protein (rM). In the test, PRRSV binds to a mixture of D5 and E9 labeled with colloidal gold; the complexes move through a membrane and are captured by rabbit anti-rM and anti-rN antibodies at a test line, producing a reddish-purple band because of the increased concentration of gold. Unbound monoclonal antibodies move past the test line to be captured by goat anti-mouse antibodies, producing a band at a control line. In samples without PRRSV or with low virus concentration, a band appears only at the control line. A crossover-trial demonstrated that the test strip was highly specific for PRRSV. The test strip detection limit was between 7.8x10(3) and 1.6x10(4) TCID(50)/ml. Analysis of 100 clinical samples indicated that the sensitivity, specificity, and accuracy of the immunochromatographic test strip relative to reverse transcription polymerase chain reaction (RT-PCR) were 97.0, 93.9, and 96.0%, respectively. Because the test is simple and rapid, it can be used by an unskilled person to detect PRRSV in the field.

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