Hot, Humid Air Decontamination of Aircraft Confirmed That High Temperature and High Humidity Are Critical for Inactivation of Infectious, Enveloped Ribonucleic Acid (RNA) Virus

• Published in: Frontiers in bioengineering and biotechnology Vol. 8; p. 592621
• Main Authors: Buhr, Tony L, Young, Alice A, Borgers-Klonkowski, Erica, Kennihan, Neil L, Barnette, Harold K, Minter, Zachary A, Bohmke, Matthew D, Osborn, Emily B, Hamilton, Shelia M, Kimani, Monique B, Hammon, Mark W, Miller, Charles T, Mackie, Ryan S, Innocenti, Jennifer M, Bensman, Misty D, Gutting, Bradford W, Lilly, Samuel D, Hammer, Emlyn E, Yates, Vanessa L, Luck, Brooke B
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Media S.A 23-10-2020
• Subjects: aircraft; Bioengineering and Biotechnology; decontamination; enveloped virus; hot humid air; Φ6; decontamination; hot humid air; aircraft; enveloped virus
• ISSN: 2296-4185; 2296-4185
• DOI: 10.3389/fbioe.2020.592621

To develop infectious (live/dead) enveloped virus test indicators and response surface methodology (RSM) models that evaluate survival of an enveloped ribonucleic acid (RNA) virus on contaminated aircraft materials after exposure to hot, humid air (HHA).
Enveloped RNA bacteriophage Phi6 (Φ6) was dried on wiring insulation, aircraft performance coating (APC), polypropylene, and nylon at ≥ 8 log
plaque-forming units (PFU) test coupon
. Only 2.4 log
inactivation was measured on APC at 70°Celsius (°C), 5% relative humidity (RH) after 24 h. In contrast, HHA RSM models showed a 90% probability of a 7 log
inactivation at ≥63°C, 90% RH after 1 h, and decontamination kinetics were similar across different materials. HHA decontamination of C-130 and C-17 aircraft showed >7 log
and ≥5.9 log
inactivation of enveloped virus on 100 and 110 test indicators, respectively, with a 1-h treatment, excluding ramp-up and ramp-down times.
Enveloped RNA virus test indicators were successfully developed, lab tested for HHA decontamination, analyzed for RSM, and field-tested in aircraft demonstrations.
The utility of HHA decontamination was demonstrated after inactivating enveloped RNA virus on aircraft with a 1-h HHA treatment within aircraft temperature and RH limits.