Development of a realtime RT-PCR assay for the rapid detection of influenza A(H2) viruses.
Identifieur interne : 000036 ( PubMed/Corpus ); précédent : 000035; suivant : 000037Development of a realtime RT-PCR assay for the rapid detection of influenza A(H2) viruses.
Auteurs : Andrey Komissarov ; Artem Fadeev ; Anna Kosheleva ; Kseniya Sintsova ; Mikhail GrudininSource :
- Molecular and cellular probes [ 1096-1194 ] ; 2017.
English descriptors
- KwdEn :
- MESH :
- genetics : Influenza A virus.
- isolation & purification : Influenza A virus.
- methods : Real-Time Polymerase Chain Reaction.
- Animals, Humans, Reproducibility of Results.
Abstract
Influenza and other acute respiratory infections are of great concern for public health, causing excessive morbidity and mortality throughout the world. Influenza virus A(H2N2), which caused a pandemic of so called "Asian flu" in 1957 was expelled from the human population by the new pandemic virus subtype H3N2 in 1968, however, influenza A(H2) viruses continue to circulate in wild birds and poultry. The lack of immunity in human population and the continued circulation of influenza A(H2) among animals makes emergence of a new pandemic virus possible. One of the basic techniques of molecular diagnostics of infectious diseases is the realtime polymerase chain reaction (PCR). The aim of this work was to design oligonucleotide primers and probes for the rapid detection of influenza A virus subtype H2 by realtime reverse transcription - polymerase chain reaction (rRT-PCR). Analysis of 539 sequences of influenza A(H2N2) virus hemagglutinin gene from GISAID EpiFlu database revealed conservative regions suitable for use as binding sites for primers and probes. 191 probes were designed and 2 sets of primers and probes (H2-1 and H2-2) were selected for further experimental evaluation. Detection limit of RT-PCR system was 50 copies of DNA per 25 μl reaction when 10-fold dilutions of pCI-neo-H2 plasmid used as template. Analytical specificity of selected sets of primers and probes were tested on wide range of influenza strains and non-influenza respiratory viruses. H2-2 set found to have insufficient specificity detecting seasonal influenza A(H1N1) viruses and was excluded from further analysis. Analytical sensitivity was further tested on vaccine strain A/17/California/66/395 (H2N2) and A/Japan/305/1957 (H2N2), limit of detection for primers-probe set H2-1 was 3.2 (CI95%: 3.07-3.48) lg EID50/ml. Designed primers and probes for the realtime RT-PCR universal detection of influenza A(H2) viruses could be used in clinical trials of vaccines against influenza A(H2) and screening for H2 in cases of unsubtypeable influenza A in humans.
DOI: 10.1016/j.mcp.2017.06.005
PubMed: 28652020
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pubmed:28652020Le document en format XML
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<front><div type="abstract" xml:lang="en">Influenza and other acute respiratory infections are of great concern for public health, causing excessive morbidity and mortality throughout the world. Influenza virus A(H2N2), which caused a pandemic of so called "Asian flu" in 1957 was expelled from the human population by the new pandemic virus subtype H3N2 in 1968, however, influenza A(H2) viruses continue to circulate in wild birds and poultry. The lack of immunity in human population and the continued circulation of influenza A(H2) among animals makes emergence of a new pandemic virus possible. One of the basic techniques of molecular diagnostics of infectious diseases is the realtime polymerase chain reaction (PCR). The aim of this work was to design oligonucleotide primers and probes for the rapid detection of influenza A virus subtype H2 by realtime reverse transcription - polymerase chain reaction (rRT-PCR). Analysis of 539 sequences of influenza A(H2N2) virus hemagglutinin gene from GISAID EpiFlu database revealed conservative regions suitable for use as binding sites for primers and probes. 191 probes were designed and 2 sets of primers and probes (H2-1 and H2-2) were selected for further experimental evaluation. Detection limit of RT-PCR system was 50 copies of DNA per 25 μl reaction when 10-fold dilutions of pCI-neo-H2 plasmid used as template. Analytical specificity of selected sets of primers and probes were tested on wide range of influenza strains and non-influenza respiratory viruses. H2-2 set found to have insufficient specificity detecting seasonal influenza A(H1N1) viruses and was excluded from further analysis. Analytical sensitivity was further tested on vaccine strain A/17/California/66/395 (H2N2) and A/Japan/305/1957 (H2N2), limit of detection for primers-probe set H2-1 was 3.2 (CI95%: 3.07-3.48) lg EID<sub>50</sub>
/ml. Designed primers and probes for the realtime RT-PCR universal detection of influenza A(H2) viruses could be used in clinical trials of vaccines against influenza A(H2) and screening for H2 in cases of unsubtypeable influenza A in humans.</div>
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<Abstract><AbstractText>Influenza and other acute respiratory infections are of great concern for public health, causing excessive morbidity and mortality throughout the world. Influenza virus A(H2N2), which caused a pandemic of so called "Asian flu" in 1957 was expelled from the human population by the new pandemic virus subtype H3N2 in 1968, however, influenza A(H2) viruses continue to circulate in wild birds and poultry. The lack of immunity in human population and the continued circulation of influenza A(H2) among animals makes emergence of a new pandemic virus possible. One of the basic techniques of molecular diagnostics of infectious diseases is the realtime polymerase chain reaction (PCR). The aim of this work was to design oligonucleotide primers and probes for the rapid detection of influenza A virus subtype H2 by realtime reverse transcription - polymerase chain reaction (rRT-PCR). Analysis of 539 sequences of influenza A(H2N2) virus hemagglutinin gene from GISAID EpiFlu database revealed conservative regions suitable for use as binding sites for primers and probes. 191 probes were designed and 2 sets of primers and probes (H2-1 and H2-2) were selected for further experimental evaluation. Detection limit of RT-PCR system was 50 copies of DNA per 25 μl reaction when 10-fold dilutions of pCI-neo-H2 plasmid used as template. Analytical specificity of selected sets of primers and probes were tested on wide range of influenza strains and non-influenza respiratory viruses. H2-2 set found to have insufficient specificity detecting seasonal influenza A(H1N1) viruses and was excluded from further analysis. Analytical sensitivity was further tested on vaccine strain A/17/California/66/395 (H2N2) and A/Japan/305/1957 (H2N2), limit of detection for primers-probe set H2-1 was 3.2 (CI95%: 3.07-3.48) lg EID<sub>50</sub>
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