Scientists give a "road map" for global influenza virus transmission

Release date: 2008-05-19

Scientists give a "road map" for global influenza virus transmission

An international research team has said that seasonal influenza virus strains usually first appear in Asia and then spread to other parts of the world within a few months. This is the latest “road map” for scientists to disseminate seasonal influenza viruses, which is expected to help countries monitor influenza transmission more specifically.
Scientists in Europe, Australia, Japan, and the United States have studied as many as 13,000 H3N2 subtype influenza virus samples from around the world.
H3N2 is a subtype of influenza A (type A) influenza virus and is the major influenza subtype that currently causes human disease or even death.
Scientists report in a new issue of the journal Science that they analyzed the differences between the different proteins on the surface of the virus, hemagglutinin, and compared the genetic sequences of these viruses that encode "hemagglutinin." "Hemagglutinin" plays an important role in the interpersonal transmission of the virus. With the analysis of "hemagglutinin", scientists can identify new strains of influenza virus that are transmitted to new locations.
The analysis showed that the H3N2 subtype influenza virus strain appeared in East Asia and Southeast Asia every year and was cross-exposed there. The strains continue to mutate and arrive in Europe and North America after about six to nine months. After that, the virus continued to spread to South America, and usually stopped after South America.
According to the research team, from the perspective of the spread of the flu virus, it is important to strengthen the surveillance of flu epidemics in East Asia and Southeast Asia, so as to more accurately predict the types of flu viruses in other parts of the world, and provide more targeted flu every year. vaccine. In addition, in view of the trans-regional transmission characteristics of influenza, national researchers should also strengthen cooperation and information communication on influenza surveillance.
According to statistics from the World Health Organization, about 3 million to 5 million people worldwide suffer from severe influenza epidemics every year due to influenza infection. The flu vaccine is a powerful weapon against people from the flu, killing about 300 million people every year from the flu. ——Midi Medical Network

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