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Development of a real-time TaqMan RT-PCR assay for the detection of H9N2 avian influenza viruses.

Abstract：

:Avian influenza viruses (AIVs) of the H9N2 subtype are a major economic problem in the poultry industry in Israel. Most field isolates from the last decade differ significantly from H9N2 isolates from Europe and the USA, rendering published detection methods inadequate. This study aimed to develop a real-time TaqMan((R)) RT-PCR assay, based on a conserved region in the HA9 gene. The assay was validated with viruses representing different genetic subtypes and other common avian pathogens, and was found specific to H9N2. The real-time RT-PCR assay was compared to RT-PCR, which is in routine diagnostic use. Real-time RT-PCR was found to be more sensitive than RT-PCR by 1.5-2.5 orders of magnitude when testing tracheal swabs directly and by 2-3 orders of magnitude allantoic fluid after AIV propagation in embryonated eggs. Sensitivity was quantified by using 10-fold dilutions of the H9-gene amplification fragment, and real-time RT-PCR was found to be 10(4)-fold more sensitive than RT-PCR. Clinical samples, which included tracheal and cloacal swabs, as well as allantoic fluid, were tested by both methods. By real-time RT-PCR 20% more positive H9N2 samples were detected than by RT-PCR. The real-time RT-PCR assay was found suitable for detection and epidemiological survey not only of Israeli H9N2 viruses, but also for isolates from other parts of the world.

journal_name

J Virol Methods

journal_title

Journal of virological methods

authors

Ben Shabat M,Meir R,Haddas R,Lapin E,Shkoda I,Raibstein I,Perk S,Davidson I

doi

10.1016/j.jviromet.2010.04.019

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

72-7

issue

1-2

eissn

0166-0934

issn

1879-0984

pii

S0166-0934(10)00155-2

journal_volume

168

pub_type

杂志文章

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