Using methods described previously,1,2 we extracted DNA from a single sample of lung tissue and sequenced the DNA on a single Illumina MiSeq run, according to the manufacturer's instructions (for a more complete description of our methods and results, see the Supplementary Appendix).
We obtained 5.5 million paired-end reads (deposited in the Sequence Read Archive with the accession number SRP018736). Less than 1% of the reads aligned against the human genome, whereas 8% aligned against the M. tuberculosis reference strain H37Rv; this was an average per-sample depth of coverage of 32× of the M. tuberculosis genome (see the Supplementary Appendix). Because we have not cultured M. tuberculosis or performed any M. tuberculosis–specific PCR analyses in our laboratory, and because we obtained deep and even genomic coverage, we believe the odds of having obtained artifactual sequences owing to contamination to be very low.