A note from today's OpinionJournal gave me a real belly laugh:

The number of new AIDS cases in America is rising, CNN claims, citing Ronald Valdiserri of the Centers for Disease Control and Prevention. "Of the estimated 1 million Americans with HIV/AIDS, about half are not receiving medical care, often because they don't know they're infected, Valdiserri said."

If they don't know they're infected, how does Valdiserri know?