-

nihao guest [ sign in / register ]
2019-11-18 18:55:53


Chan WM, et al. Development and evaluation of a conventional RT-PCR for differentiating emerging influenza B/Victoria lineage viruses with hemagglutinin amino acid deletion from B/Yamagata lineage viruses. J Med Virol. 2019 Oct 14
submited by kickingbird at Oct, 17, 2019 6:52 AM from J Med Virol. 2019 Oct 14

BACKGROUND:
Recent influenza B/Victoria lineage viruses contain amino-acid deletions at positions 162-164 of the haemagglutinin (HA) protein. These amino acid deletions have affected the detection of B/Victoria lineage viruses by the lineage-specific conventional reverse transcription-polymerase chain reaction (RT-PCR) that was recommended by World Health Organization (WHO).
OBJECTIVES:
We aimed to develop and evaluate a novel lineage-specific RT-PCR for rapid differentiation of the contemporary B/Victoria lineage from B/Yamagata lineage viruses.
STUDY DESIGN:
Primers of our in-house RT-PCR were designed to avoid amino acid positions 162-164 and to target conserved regions of the HA gene that are specific for B/Victoria and B/Yamagata lineage viruses. Our in-house RT-PCR and WHO RT-PCR were evaluated using influenza B positive clinical specimens or virus culture isolates. Influenza B virus lineage was confirmed by Sanger sequencing.
RESULTS:
A total of 105 clinical specimens or virus culture isolates were retrieved, including 83 with B/Victoria lineage and 22 with B/Yamagata lineage viruses. Our in-house RT-PCR correctly identified B/Victoria lineage viruses in all 83 samples, including 82 samples with double or triple amino acid deletion in the HA protein. Conversely, the WHO lineage-specific conventional RT-PCR failed to detect any of the 82 samples with HA amino acid deletions. For the 22 samples with B/Yamagata lineage viruses, both RT-PCR assays have correctly identified B/Yamagata lineage in all samples.
CONCLUSIONS:
Our novel lineage-specific RT-PCR has successfully detected all contemporary B/Victoria lineage viruses with amino acid deletions in HA. This protocol is especially useful for laboratories without the equipment for real-time PCR.

See Also:

Latest articles in those days:

[Go Top]    [Close Window]

Related Pages:
Learn about the flu news, articles, events and more
Subscribe to the weekly F.I.C newsletter!


  

Site map  |   Contact us  |  Term of use  |  FAQs
Copyright ©www.flu.org.cn. 2004-2019. All Rights Reserved. Powered by FIC 4.0.1
  Email:webmaster@flu.org.cn