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Furthermore , the family experienced 3 additional cases of respiratory tract disease with 1 associated death , but the H5N1 virus was not known to be the cause of these illnesses at the time of publication . Tomorrow , I will be traveling to East Asia to the areas most impacted by the avian influenza - - something more commonly referred to as the bird flu , or the H5N1 virus . Through a series of events suited to a detective novel , researchers made a connection between Brevig Mission and the flu virus that may help prevent another outbreak of the 1918 flu , one of the worst epidemics ever experienced .