Top health stories of 2011 from CNN

(CNN) -- The most deadly recorded listeria outbreak and concerns about nuclear radiation after Japan's biggest earthquake made major health headlines this year, along with several notable deaths to cancer and the inspiring recovery of a Congresswoman who suffered brain injuries from a gunshot wound.

Here's a look back at some of the top stories of 2011, a year that marked major anniversaries in some of the world's most pernicious diseases -- HIV/AIDS and the "war" on cancer.

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