Bacillus sp. strain NCTC 8241 [CCM 2218, DSM 361, NCIB 8982] is a whole-genome sequenced bacterial strain. This bacterium has applications in assays of chlortetracycline, erythromycin, framycetin, gentamicin, lymecycline, neomycin, oxytetracycline, and tetracycline. It can also be used as a sterilization control.