Technical Comments

Comment on “Evidence for Positive Epistasis in HIV-1”

Science  12 May 2006:
Vol. 312, Issue 5775, pp. 848b
DOI: 10.1126/science.1109904

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Bonhoeffer et al. (Reports, 26 November 2004, p. 1547) presented evidence for positive epistasis in a clinical data set of HIV-1 mutants and corresponding fitness values. We demonstrate that biases in the original and simulated data sets may lead to erroneous evidence for epistasis. More rigorous statistical tests must be used to account for such biases before one can infer epistasis.

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