It's tough to say exactly how accurate this data is, because not everyone who experiences the flu will head to the hospital to be treated. And in some states, like Washington, D.C. and Connecticut, they couldn't collect enough data to tally the number of people with the flu. The CDC has an interactive map on their website that allows you to see how the virus spreads and worsens throughout the season. Below is a snapshot of where last week's activity level landed: