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J Clin Virol. 2015 Jul;68:97-103. doi: 10.1016/j.jcv.2015.05.018. Epub 2015 May 23.
Quantitative analysis of influenza A (H3N2) E119V and R292K variants in clinical specimens by real-time reverse transcription polymerase chain reaction.
Sato M1, Honzumi K2, Sato T3, Hashimoto K4, Watanabe M5, Miyazaki K6, Kawasaki Y7, Hosoya M8.
Author information
Abstract
BACKGROUND:
Because influenza virus isolates after cell culture are required to determine their susceptibility to neuraminidase inhibitors, the differences in normal or low-susceptibility variant population frequencies between clinical samples and isolates have not been considered.
OBJECTIVES:
To identify variations in low-susceptibility populations in clinical samples after initiation of oseltamivir and zanamivir therapy by quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR).
STUDY DESIGN:
We measured the populations of the low-susceptibility influenza A H3N2 variants E119V and R292K by qRT-PCR using 305 nasal aspiration samples collected over time from 13, 16, and 11 patients treated with no neuraminidase inhibitors, oseltamivir, and zanamivir, respectively. The variant population in the isolates was also determined when the population of low-susceptibility variants in the clinical samples increased following treatment. Moreover, the susceptibility of all isolates was measured.
RESULTS:
The E119V variant was detected in only one patient during oseltamivir therapy, exhibiting decreased susceptibility to oseltamivir. Prior to treatment, R292K variants were detected in all clinical samples; however, they comprised only a small fraction of the total population. The proportion of the R292K variant in clinical samples increased for 6/27 (22.2%) patients treated with oseltamivir or zanamivir, whereas an increase in the proportion of the R292K variant in virus isolates was observed in only one patient.
CONCLUSIONS:
Discrepancies in the proportion of R292K variants between clinical samples and isolates should be suspected in clinical settings. qRT-PCR is useful for quantitative analysis of drug-resistant influenza virus and for immediate notification of the result.
Copyright ? 2015. Published by Elsevier B.V.
KEYWORDS:
Antiviral therapy; Neuraminidase inhibitor; Oseltamivir; Polymerase chain reaction; Resistant virus; Zanamivir
PMID: 26071346 [PubMed - in process]
Quantitative analysis of influenza A (H3N2) E119V and R292K variants in clinical specimens by real-time reverse transcription polymerase chain reaction.
Sato M1, Honzumi K2, Sato T3, Hashimoto K4, Watanabe M5, Miyazaki K6, Kawasaki Y7, Hosoya M8.
Author information
Abstract
BACKGROUND:
Because influenza virus isolates after cell culture are required to determine their susceptibility to neuraminidase inhibitors, the differences in normal or low-susceptibility variant population frequencies between clinical samples and isolates have not been considered.
OBJECTIVES:
To identify variations in low-susceptibility populations in clinical samples after initiation of oseltamivir and zanamivir therapy by quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR).
STUDY DESIGN:
We measured the populations of the low-susceptibility influenza A H3N2 variants E119V and R292K by qRT-PCR using 305 nasal aspiration samples collected over time from 13, 16, and 11 patients treated with no neuraminidase inhibitors, oseltamivir, and zanamivir, respectively. The variant population in the isolates was also determined when the population of low-susceptibility variants in the clinical samples increased following treatment. Moreover, the susceptibility of all isolates was measured.
RESULTS:
The E119V variant was detected in only one patient during oseltamivir therapy, exhibiting decreased susceptibility to oseltamivir. Prior to treatment, R292K variants were detected in all clinical samples; however, they comprised only a small fraction of the total population. The proportion of the R292K variant in clinical samples increased for 6/27 (22.2%) patients treated with oseltamivir or zanamivir, whereas an increase in the proportion of the R292K variant in virus isolates was observed in only one patient.
CONCLUSIONS:
Discrepancies in the proportion of R292K variants between clinical samples and isolates should be suspected in clinical settings. qRT-PCR is useful for quantitative analysis of drug-resistant influenza virus and for immediate notification of the result.
Copyright ? 2015. Published by Elsevier B.V.
KEYWORDS:
Antiviral therapy; Neuraminidase inhibitor; Oseltamivir; Polymerase chain reaction; Resistant virus; Zanamivir
PMID: 26071346 [PubMed - in process]