Surveillance of adamantane and oseltamivir resistance among influenza viruses was started in Hong Kong in 2006 following a report of high rate of adamantane resistance among influenza A/H3N2 viruses1 and the purchase of stockpile of oseltamivir for pandemic preparedness. With the emergence of pandemic influenza A/H1N1 virus, in addition to the RT-PCR to detect the virus rapidly, respiratory specimens from suspected cases were also inoculated onto MDCK cells. Isolates were identified using immunofluorescence and haemagglutination inhibition tests.
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