New study sheds light on evolution of 2009 pandemic influenza A(H1N1) virus in Japan

A unique triple combination of bird, swine and human flu viruses, the pandemic influenza A(H1N1) virus, first detected in April of 2009, quickly spread from Mexico to locations across the world. By April 2010, outbreaks of the disease at both local and global scales had resulted in roughly 18,000 deaths worldwide, causing serious damage both to human health and on the global economy.

In Japan, the first case of the pandemic was reported on May 9, 2009, thereafter spreading to hundreds of people in Osaka and Kobe and eventually leading to more than 200 deaths in the country. Existing research on the spread of the virus in Japan has provided valuable information on local strains during the early phase of infection and on their classification into different groups. How the pandemic evolved to reach its peak phase of contagion, however, is not yet well understood.

To clarify the genetic basis for this evolution, the OSC group studied 253 samples of the virus collected from the Osaka area during the initial phase (May, 2009) and from the Kansai and Kanto areas during the peak phase (October, 2009 to January 2010) of contagion. Of 20 different mutation groups identified in the peak infection group, analysis revealed that 12 were entirely new to Japan. Rapid mutation of the virus strains was traced to a genome with an extremely high evolutionary rate.

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This map shows the hospitals, clinics, and public health institutes that contributed to the collection of swab samples from influenza patients. Credit: RIKEN

Among the variety of mutants discovered, the researchers were able to pinpoint two mutations which clearly differentiate the early phase and peak phase viruses. They also identified mutations in some viruses which confer resistance to Oseltamivir (Tamiflu), one of the most widely-used antiviral drugs. Published in the journal PLoS ONE, the findings together mark a major advance in efforts to understand the genetic origins of the 2009 A(H1N1) virus, and a key step in OSC-centered efforts to develop on-site detection techniques for controlling infection of deadly pandemics.

Provided by RIKEN