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Swine Flu Virus may Become Resistant to Tamiflu
OSU scientists traced the evolutionary history of the seasonal H1N1 influenza virus, which first infected humans during the 1918 pandemic. It is one of three seasonal influenza A viruses that commonly infect humans. The others are H1N2 and H3N2. Within H1N1, two strains of virus circulate in humans: a seasonal form and the pandemic form of influenza known as swine flu, which has affected millions and killed thousands of people since it first emerged in North America last spring.
Gradually, the H1N1 strain of seasonal influenza surviving around the world has developed mutations that have caused it to become resistant to oseltamivir-based agents. Tamiflu is the trade name for oseltamivir phosphate.
Daniel Janies, associate professor of biomedical informatics at Ohio State and primary author of the study, said: "Something happened in 2008, when drug resistance took hold.
"The drug-resistant isolates became the ones that survived all over the world. This is just static now. The seasonal H1N1 influenza virus is fixed at resistant."
Janies and his team have traced the history of the same mutation in the pandemic H1N1 strain of the virus as well, with data from its emergence last spring until last December. And they are beginning to see the same kinds of mutation in this virus - changes to an amino acid that allow the virus to resist the effects of oseltamivir - that they saw in the seasonal H1N1 flu.
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