Format

Send to:

Choose Destination
See comment in PubMed Commons below
Emerg Infect Dis. 2009 Feb;15(2):155-62.

Oseltamivir-resistant influenza viruses A (H1N1), Norway, 2007-08.

Author information

  • 1Norwegian Institute of Public Health, Oslo, Norway.

Abstract

In Norway in January 2008, unprecedented levels of oseltamivir resistance were found in 12 of 16 influenza viruses A (H1N1) tested. To investigate the epidemiologic and clinical characteristics of these viruses, we used sequence analysis to test all available subtype H1N1 viruses from the 2007-08 season for resistance. Questionnaires from physicians provided information on predisposing diseases, oseltamivir use, symptoms, and complications. Clinical data were obtained for 265 patients. In total, 183 (67.3%) of 272 viruses were oseltamivir resistant. Resistance was not associated with prior use of antiviral drugs. Symptoms and hospitalization rates did not differ for patients infected with a resistant or a susceptible virus. Oseltamivir-resistant influenza viruses A (H1N1) did not show diminished capability to spread in the absence of selective pressure. The ability of these viruses to sustain their fitness and spread among persons should be considered when shaping future strategies for treating and preventing seasonal and pandemic influenza.

PMID:
19193257
[PubMed - indexed for MEDLINE]
PMCID:
PMC2657637
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for CDC-NCEZID Icon for PubMed Central
    Loading ...
    Write to the Help Desk