Stopcock contamination.
D000758:Anesthesia / Q000379:methods*; D004926:Escherichia coli / Q000254:growth & development; D006801:Humans; D008837:Micrococcus / Q000254:growth & development; D013210:Staphylococcus / Q000254:growth & development; D013211:Staphylococcus aureus / Q000254:growth & development; D013242:Sterilization