In the October 2016 issue, the piece “Reservoirs of resistance: To understand why antibiotics fail, geneticists chase the 'resistome'” (Nat. Med. 22, 1069–1071, 2016) incorrectly stated that PCR sequencing is a form of short-read sequencing. The article also incorrectly attributed a quote to Justin O'Grady instead of to Gautam Dantas. These errors have been corrected in the HTML and PDF versions of this article.