To the Editor—Burgess et alReference Burgess, Margolis, Gibbs, Duarte and Jackson ¹ describe important findings on how to effectively kill glutaraldehyde-resistant mycobacterial strains. Based on the data described, oxidizing agents seem to be effective against them in short exposure times at elevated temperatures, similar to the results reported by other authors.Reference Lynam, Babb and Fraise ^{2 –} Reference Griffiths, Babb and Fraise ⁴ While the preparation of the aldehydes is described in detail (ie, final concentration of the active ingredient), this important piece of information is completely missing for all 3 Steris products based on peracetic acid or hydrogen peroxide. Minimum effective concentration (MEC) values are described for the aldehyde-based products, but no minimal regrowth concentration (MRC) values are provided for the oxidizers. Mentioning only the name of a product is not sufficient for the scientific community; readers may also want to understand how exactly the solutions were prepared (especially when at least 1 product seems to be a powder or when products consist of more than 1 component). Readers may also want to see the final concentration of each active ingredient for all 3 products (eg, peracetic acid and hydrogen peroxide). Only these details will allow us to critically evaluate the effectiveness of the biocidal agents described in the study.