Two articles from National Geographic and ESL-Bits talked about the flu. They showed some information about CDC, H3N2, and a universal vaccine. In the article from National Geographic, it compared H1N1 to H3N2. Also, it indicated two kinds of influenza, A and B. On the other hand, in the article from ESL-Bits, it showed more specific information about the flu. For example, elderberry versus tamiflu, side effects, and costs. In my opinion, we should take the influenza vaccine every year.