In America the Centres for Disease Control and Prevention (CDC) say that the bird flu virus is changing and that it is developing strains and properties which could possibly increase the potential of it to infect humans from birds. They also said that it was also developing into a virus which could become more contagious between humans. The research was done on the Influenza A H7 virus types which are very contagious to birds but must not be mixed up with with the extremely deadly H5N1 bird flu virus. Nevertheless it is worth noting that if an H7 bird flu virus mutates it is likely that the H5N1 variant of the virus will also be able to follow suit. Dr. Jessica Belser who led the research project for the Centres for Disease Control and Prevention explained that it is perfectly normal for influenza viruses to constantly change and in view of the fact that there is the scare of a deadly bird flu outbreak is very important that they are watched extremely carefully at the moment. More
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