It's true that most people infected with the new H1N1 virus have recovered fully without medical treatment. But this virus continues to show disturbing differences from run-of-the-mill flu viruses. First, it didn't disappear over the summer. Historically, such persistence is a warning sign that a colossal fall and winter wave is in store. Government experts estimate that this flu could infect as many as half of all Americans.Second, this virus has caused more severe illness in those under 25 than in those over 65 years of age (the population that typically suffers some of the most serious cases of seasonal flu). That's an indication that being in good health doesn't assure protection against serious—even deadly—complications.
For these reasons, the U.S. Centers for Disease Control and Prevention (CDC) continues to urge everyone to protect themselves by practicing good health hygiene (see "The (Swine) Flu Stops Here") and getting immunized when the H1N1 vaccine becomes available.