Primer, probe series and method for multiple real time fluorescent RT-PCR detection of H5, H7 and H9 subtype bird flu
A RT-PCR, real-time fluorescence technology, applied in biochemical equipment and methods, microbial determination/inspection, etc., can solve problems such as high variability, and achieve good specificity, simple operation, accurate and sensitive results.
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Embodiment 1
[0048] (1) Preparation of the template to be tested
[0049] Method 1 Use the QIAamp Viral RNA Mini kit to extract the genomic RNA of avian influenza virus in samples from various sources. The specific operation steps are as follows:
[0050] a. Take 560 μl of AVL buffer containing carrier RNA to a 1.5ml microcentrifuge tube;
[0051] b. Add 140 μl of plasma, serum, urine sample, cell culture supernatant or PBS cleaning solution of swab, and vortex for 15 sec;
[0052] c. Incubate at room temperature (15-25°C) for 10 minutes;
[0053] d. Centrifuge briefly so that the liquid on the cover is centrifuged into the centrifuge tube;
[0054] e. Add 560 μl of absolute ethanol, vortex for 15 sec, centrifuge briefly, and centrifuge the liquid on the cover into the centrifuge tube;
[0055] f. Carefully pipette 630 μl of the above liquid into the QIAamp spin column (placed in a 2 ml collection tube), without wetting the edge of the tube, and centrifuge at 8000 rpm for 1 min. Discar...
Embodiment 2
[0071] Duplex real-time fluorescent RT-PCR detection of avian influenza H5 and H9 subtypes
[0072] In a 50 μl reaction system, use specific primers and probes for avian influenza H5 and H9 subtypes to perform double real-time fluorescent RT-PCR to detect positive samples containing avian influenza virus H5 and H9 subtype genomic RNA, and the results can be obtained Specific fluorescence curve ( image 3 ).
Embodiment 3
[0074] Duplex real-time fluorescent RT-PCR detection of avian influenza H7 and H9 subtypes
[0075] In a 50 μl reaction system, use specific primers and probes for avian influenza H7 and H9 subtypes to perform double real-time fluorescent RT-PCR to detect positive samples containing avian influenza virus H7 and H9 subtype genomic RNA, and the results can be obtained Specific fluorescence curve ( Figure 4 ).
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