Saint Louis County has received more than 500 cases since Wednesday . Thousands of Americans being prepared for trials in hundreds of sites across nation . Patients will be able to keep healthy while they are monitored for two months . `` It 's looking more and more like we 're going to have a big flu outbreak this fall as soon as the kids get back to school , '' Belshe told CNN Radio . `` Influenza is unpredictable , but I believe this pandemic will hit pre-teens , teens and their parents hard , and as many as 60 million Americans could be sick with the flu . Doctor says virus could kill one in five people this fall and peak in October .
Saint Louis County has received more than 500 cases since Wednesday . Thousands of Americans being prepared for trials in hundreds of sites across nation . Patients will be able to keep healthy while they are monitored for two months . Doctor says virus could kill one in five people this fall and peak in October .