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J Mol Diagn. 2010 Jul 1. [Epub ahead of print]
Influenza A Subtyping. Seasonal H1N1, H3N2, and the Appearance of Novel H1N1.
Kaul KL, Mangold KA, Du H, Pesavento KM, Nawrocki J, Nowak JA.
From the Department of Pathology and Laboratory Medicine,* and Center for Outcomes, Research and Education, NorthShore University HealthSystem, Evanston, Illinois; and the Illinois Department of Public Health, Chicago, Illinois.
Abstract
Influenza virus subtyping has emerged as a critical tool in the diagnosis of influenza. Antiviral resistance is present in the majority of seasonal H1N1 influenza A infections, with association of viral strain type and antiviral resistance. Influenza A virus subtypes can be reliably distinguished by examining conserved sequences in the matrix protein gene. We describe our experience with an assay for influenza A subtyping based on matrix gene sequences. Viral RNA was prepared from nasopharyngeal swab samples, and real-time RT-PCR detection of influenza A and B was performed using a laboratory developed analyte-specific reagent-based assay that targets a conserved region of the influenza A matrix protein gene. FluA-positive samples were analyzed using a second RT-PCR assay targeting the matrix protein gene to distinguish seasonal influenza subtypes based on differential melting of fluorescence resonance energy transfer probes. The novel H1N1 influenza strain responsible for the 2009 pandemic showed a melting profile distinct from that of seasonal H1N1 or H3N2 and compatible with the predicted melting temperature based on the published novel H1N1 matrix gene sequence. Validation by comparison with the Centers for Disease Control and Prevention real-time RT-PCR for swine influenza A (novel H1N1) test showed this assay to be both rapid and reliable (>99% sensitive and specific) in the identification of the novel H1N1 influenza A virus strain.
PMID: 20595627 [PubMed - as supplied by publisher]
Influenza A Subtyping. Seasonal H1N1, H3N2, and the Appearance of Novel H1N1.
Kaul KL, Mangold KA, Du H, Pesavento KM, Nawrocki J, Nowak JA.
From the Department of Pathology and Laboratory Medicine,* and Center for Outcomes, Research and Education, NorthShore University HealthSystem, Evanston, Illinois; and the Illinois Department of Public Health, Chicago, Illinois.
Abstract
Influenza virus subtyping has emerged as a critical tool in the diagnosis of influenza. Antiviral resistance is present in the majority of seasonal H1N1 influenza A infections, with association of viral strain type and antiviral resistance. Influenza A virus subtypes can be reliably distinguished by examining conserved sequences in the matrix protein gene. We describe our experience with an assay for influenza A subtyping based on matrix gene sequences. Viral RNA was prepared from nasopharyngeal swab samples, and real-time RT-PCR detection of influenza A and B was performed using a laboratory developed analyte-specific reagent-based assay that targets a conserved region of the influenza A matrix protein gene. FluA-positive samples were analyzed using a second RT-PCR assay targeting the matrix protein gene to distinguish seasonal influenza subtypes based on differential melting of fluorescence resonance energy transfer probes. The novel H1N1 influenza strain responsible for the 2009 pandemic showed a melting profile distinct from that of seasonal H1N1 or H3N2 and compatible with the predicted melting temperature based on the published novel H1N1 matrix gene sequence. Validation by comparison with the Centers for Disease Control and Prevention real-time RT-PCR for swine influenza A (novel H1N1) test showed this assay to be both rapid and reliable (>99% sensitive and specific) in the identification of the novel H1N1 influenza A virus strain.
PMID: 20595627 [PubMed - as supplied by publisher]
