FDA Approves H1N1 - say what?

FDA Approves H1N1 Vaccinehttp://www.fda.gov/ForConsumers/ConsumerUpdates/ucm182624.htm 

"What have studies of the H1N1 vaccines shown?
Based on preliminary data, the approved vaccines induce a robust immune response in most healthy adults eight to 10 days after a single dose, as occurs with the seasonal influenza vaccine."

    And scientists wonder why the general public is skeptical!