| rapid spread of drug-resistant influenza a viruses in the basque country, northern spain, 2000-1 to 2008-9. | a worldwide increase of adamantane-resistant influenza a(h3n2) and oseltamivir-resistant influenza a(h1n1) viruses has been observed in recent years. the aim of this study was to analyse the prevalence of antiviral drug-resistant influenza a in a region of northern spain. resistance to adamantanes was detected in 45.3% (68/150) of influenza ah3 viruses analysed for the period from 2000-1 to 2008-9. adamantane-resistance was absent in our region during the 2000-1 to 2002-3 influenza seasons. howe ... | 2009 | 19460286 |