Deactivation of the dimorphic fungi Histoplasma capsulatum, Blastomyces dermatitidis and Coccidioides immitis using hydrogen peroxide vapor.
Hydrogen peroxide vapour (HPV) has been proposed as an alternative to formaldehyde fumigation for the decontamination of biosafety level (BSL) III laboratories. The aim of this study was to evaluate the efficacy of HPV against the dimorphic fungi Histoplasma capsulatum, Blastomyces dermatitidis and Coccidioides immitis. Working inside a class II biological safety cabinet (BSC) within a BSL III laboratory, inocula containing approximately 5-log(10) cfu/ml from the mould form of each organism suspended in RPMI medium were deposited on stainless steel discs and allowed to air dry. The organisms were exposed to HPV inside a BSC using a BIOQUELL ClarusS HPV generator. In three replicate experiments, individual discs were transferred into liquid media at timed intervals during a 105 minute HPV exposure period. Control- and HPV-exposed discs were incubated in RPMI media at 30 degrees C for 6 weeks to determine if any viable organisms remained. Positive cultures were confirmed using specific nucleic acid hybridization probes. Results indicate that H. capsulatum, B. dermatitidis and C. immitis were killed within 30 minutes of HPV exposure.
Hall
Leslie
L
Division of Clinical Microbiology, Mayo Clinic, Rochester, Minnesota 55905, USA.
Otter
Jonathan A
JA
Chewins
John
J
Wengenack
Nancy L
NL
D000935:Antifungal Agents / Q000494:pharmacology*; D001758:Blastomyces / Q000187:drug effects*; D003045:Coccidioides / Q000187:drug effects*; D003666:Decontamination; D006658:Histoplasma / Q000187:drug effects*; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D014835:Volatilization
D000935:Antifungal Agents; D006861:Hydrogen Peroxide