It's time to step up that research into the H1N1 virus. The Centers for Disease Control and Prevention announced that "an estimated 22 million Americans have been sickened with swine flu since April and 3,900 have died," according to this article in the Wall Street Journal. "The sharply higher numbers of illnesses and deaths are the result of the CDC trying to better quantify the new H1N1 flu's impact, authorities said, and do not mean the disease has become more virulent."

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Senator Elizabeth Warren (D-Mass.) has released the results of a genetic ancestry analysis, the Boston Globe reports.

Retraction Watch's Ivan Oransky and Adam Marcus report that Harvard Medical School and Brigham and Women's Hospital have recommended that more than 30 papers from a former researcher be retracted.

Thomas Steitz, who won the 2009 chemistry Nobel Prize for his ribosome work, has died, the Washington Post reports.

In PLOS this week: mechanisms for genes implicated in coronary artery disease, rumen microbes and host genetics influence cow methane production, and more.