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Sensitivity of influenza viruses to zanamivir and oseltamivir: a study performed on viruses circulating in France prior to the introduction of neuraminidase inhibitors in clinical practice.
Antiviral Res 2005; 68(1):43-8AR

Abstract

Influenza virus neuraminidase inhibitors (NAIs) were introduced in clinical practice in various parts of the world since 1999 but were only scarcely distributed in France. Prior to the generalization of zanamivir and oseltamivir utilization in our country, we decided to test a large panel of influenza strains to establish the baseline sensitivity of these viruses to anti-neuraminidase drugs, based upon a fluorometric neuraminidase enzymatic test. Our study was performed on clinical samples collected by practitioners of the GROG network (Groupe Régional d'Observation de la Grippe) in the south of France during the 2002-2003 influenza season. Out of 355 isolates tested in the fluorometric neuraminidase activity assay, 267 isolates could be included in inhibition assay against anti-neuraminidase drugs. Differences in IC50 range were found according to the subtype and the anti-neuraminidase drug. Influenza B and A/H1N1 viruses appeared to be more sensitive to zanamivir than to oseltamivir (mean B IC50 values: 4.19 nM versus 13 nM; mean H1N1 IC50 values: 0.92 nM versus 1.34 nM), while A/H1N2 and A/H3N2 viruses were more sensitive to oseltamivir than to zanamivir (mean H3N2 IC50 values: 0.67 nM versus 2.28 nM; mean H1N2 IC50 values: 0.9 nM versus 3.09 nM). Out of 128 N2 carrying isolates, 10 isolates had zanamivir or oseltamivir IC50 values in upper limits compared to their respective data range. Sequencing of the neuraminidase of these outliers N2 highlighted several mutations, but none of them were associated with resistance to neuraminidase inhibitors.

Authors+Show Affiliations

Laboratoire de Virologie, Centre National de Référence pour la Grippe (France-Sud), Domaine Rockefeller, 8 Avenue Rockefeller, 69373 Lyon cedex 08, France. Ferraris@sante.univ-lyon1.frNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

16125799

Citation

Ferraris, O, et al. "Sensitivity of Influenza Viruses to Zanamivir and Oseltamivir: a Study Performed On Viruses Circulating in France Prior to the Introduction of Neuraminidase Inhibitors in Clinical Practice." Antiviral Research, vol. 68, no. 1, 2005, pp. 43-8.
Ferraris O, Kessler N, Lina B. Sensitivity of influenza viruses to zanamivir and oseltamivir: a study performed on viruses circulating in France prior to the introduction of neuraminidase inhibitors in clinical practice. Antiviral Res. 2005;68(1):43-8.
Ferraris, O., Kessler, N., & Lina, B. (2005). Sensitivity of influenza viruses to zanamivir and oseltamivir: a study performed on viruses circulating in France prior to the introduction of neuraminidase inhibitors in clinical practice. Antiviral Research, 68(1), pp. 43-8.
Ferraris O, Kessler N, Lina B. Sensitivity of Influenza Viruses to Zanamivir and Oseltamivir: a Study Performed On Viruses Circulating in France Prior to the Introduction of Neuraminidase Inhibitors in Clinical Practice. Antiviral Res. 2005;68(1):43-8. PubMed PMID: 16125799.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sensitivity of influenza viruses to zanamivir and oseltamivir: a study performed on viruses circulating in France prior to the introduction of neuraminidase inhibitors in clinical practice. AU - Ferraris,O, AU - Kessler,N, AU - Lina,B, PY - 2005/03/18/received PY - 2005/07/13/revised PY - 2005/07/13/accepted PY - 2005/8/30/pubmed PY - 2006/1/13/medline PY - 2005/8/30/entrez SP - 43 EP - 8 JF - Antiviral research JO - Antiviral Res. VL - 68 IS - 1 N2 - Influenza virus neuraminidase inhibitors (NAIs) were introduced in clinical practice in various parts of the world since 1999 but were only scarcely distributed in France. Prior to the generalization of zanamivir and oseltamivir utilization in our country, we decided to test a large panel of influenza strains to establish the baseline sensitivity of these viruses to anti-neuraminidase drugs, based upon a fluorometric neuraminidase enzymatic test. Our study was performed on clinical samples collected by practitioners of the GROG network (Groupe Régional d'Observation de la Grippe) in the south of France during the 2002-2003 influenza season. Out of 355 isolates tested in the fluorometric neuraminidase activity assay, 267 isolates could be included in inhibition assay against anti-neuraminidase drugs. Differences in IC50 range were found according to the subtype and the anti-neuraminidase drug. Influenza B and A/H1N1 viruses appeared to be more sensitive to zanamivir than to oseltamivir (mean B IC50 values: 4.19 nM versus 13 nM; mean H1N1 IC50 values: 0.92 nM versus 1.34 nM), while A/H1N2 and A/H3N2 viruses were more sensitive to oseltamivir than to zanamivir (mean H3N2 IC50 values: 0.67 nM versus 2.28 nM; mean H1N2 IC50 values: 0.9 nM versus 3.09 nM). Out of 128 N2 carrying isolates, 10 isolates had zanamivir or oseltamivir IC50 values in upper limits compared to their respective data range. Sequencing of the neuraminidase of these outliers N2 highlighted several mutations, but none of them were associated with resistance to neuraminidase inhibitors. SN - 0166-3542 UR - https://www.unboundmedicine.com/medline/citation/16125799/Sensitivity_of_influenza_viruses_to_zanamivir_and_oseltamivir:_a_study_performed_on_viruses_circulating_in_France_prior_to_the_introduction_of_neuraminidase_inhibitors_in_clinical_practice_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0166-3542(05)00142-7 DB - PRIME DP - Unbound Medicine ER -