Yesterday, the CDC said that about 3,900 Americans have died from the swine flu while 22 million had become sick from it in the past six months. The Washington Post reports that the new estimates are based on "detailed surveillance and record-checking in 10 states." Unlike the seasonal flu, in which 90% of the deaths are of people 65 and over (and many are very sick), for the swine flu, "The vast majority of deaths -- about 2,920 -- have been in people age 18 to 64."