this is katherine woodgold, seismologist of earthquake canada.hanks so much. >>> dealing with a bitter cold snap weren't enough, doctors are bracing for what could be one of the worst flew seasons? >> nearly half of the united states is experiencing wide-spread blue activity. mary are the h1n1 flu. in texas, one of the areas hardest hit, 25 people have died already this season. the state's hell department has issued an influenza health alert. in michigan, it people suffering from severe cases of the flu. >> we are seeing people generally healthy and young, 30s, 40s, 50s, come down with very serious flu-related illness support. >> what's concerning across the state of michigan is that we are seeing high volumes of influenza this early in the season. >> doctor joe rizi chief of the prevention branch in the cd c's influenza division. appreciate you being with us. i mention people have been calling this the swine flu but that's not correct? is it? >> it's not. it's really a human flew. when the flu, this virus first emerged back in 2009, it clearly a