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During 1940-2004, the number of newly emerging infectious diseases has risen significantly over time after controlling for progress in diagnosis and surveillance. The peak is in the 1980s, concomitant with the HIV pandemic.

Credit: Data gathered by Peter Daszak et al., for "Global trends in emerging infectious diseases," published in Nature 451, 990-993 (21 February 2008), Bahar Gholipour for LiveScience

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