Quantitative analysis of influenza A (H3N2) E119V and R292K variants in clinical specimens by real-time reverse transcription polymerase chain reaction.
J Clin Virol
; 68: 97-103, 2015 Jul.
Article
em En
| MEDLINE
| ID: mdl-26071346
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). STUDYDESIGN:
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.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Glicoproteínas de Hemaglutininação de Vírus da Influenza
/
Mutação de Sentido Incorreto
/
Proteínas Mutantes
/
Influenza Humana
/
Vírus da Influenza A Subtipo H3N2
Tipo de estudo:
Observational_studies
Limite:
Child
/
Child, preschool
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Clin Virol
Assunto da revista:
VIROLOGIA
Ano de publicação:
2015
Tipo de documento:
Article