Evaluation of influenza virus antiviral susceptibility testing in Europe: results from the first external quality assessment exercise.
J Clin Virol
; 56(3): 212-8, 2013 Mar.
Article
en En
| MEDLINE
| ID: mdl-23201459
ABSTRACT
BACKGROUND:
The first antiviral susceptibility testing external quality assessment (EQA) was held for European influenza reference laboratories during winter 2010/11.OBJECTIVES:
To assess European network influenza antiviral susceptibility testing capability and provide participants with an independent performance evaluation. STUDYDESIGN:
The EQA panel contained ten coded specimens of inactivated human influenza A and B viruses with reduced susceptibility to neuraminidase inhibitors (NAI), or adamantanes. Twenty-four laboratories from 19 member states of the WHO European region analysed the panel using phenotypic (determination of 50% inhibitory concentration (IC(50)) values by neuraminidase (NA) enzyme inhibition assay) and/or genotypic methods.RESULTS:
All 24 laboratories returned genotypic data for A(H1N1)pdm09 influenza virus, 18 (75%) for former seasonal A(H1N1), 16 (67%) for A(H3N2) and 15 (63%) for influenza B virus, correctly identifying NAI or adamantane reduced susceptibility-associated substitutions in the NA (mean 84%; range 52-100%) or M2 (mean 85%; range 73-94%), respectively. Thirteen laboratories (54%) returned phenotypic NAI susceptibility data. Despite inter-laboratory and inter-assay IC(50) value variation, all 13 laboratories correctly identified oseltamivir reduced susceptibility/resistance in pure preparations of A(H1N1) oseltamivir-resistant viruses. However, only 11 (85%) identified oseltamivir reduced susceptibility/resistance in a mixture of A(H1N1)pdm09 oseltamivir-sensitive/-resistant viruses. Furthermore, 3 laboratories (23%) considered oseltamivir-sensitive influenza B virus reduced susceptible/resistant.CONCLUSIONS:
Detection of NA-H275Y in A(H1N1) viruses was achieved by most laboratories. IC(50) values and interpretation thereof varied for a sensitive/resistant virus mixture and for influenza B virus. The results of this exercise will assist harmonisation of antiviral susceptibility testing, interpretation and reporting within the European network through targeted training.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Antivirales
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Virus de la Influenza A
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Virus de la Influenza B
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Pruebas de Sensibilidad Microbiana
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Ensayos de Aptitud de Laboratorios
Tipo de estudio:
Prognostic_studies
País como asunto:
Europa
Idioma:
En
Año:
2013
Tipo del documento:
Article