Safe use of PHI6 IN the experimental studies

Area of Science:

• Environmental Science
• Microbiology
• Public Health

Background:

• Studying indoor viral spread is crucial, especially during pandemics.
• Surrogate viruses offer a safe alternative for human and environmental research.
• The safety of high-concentration aerosolized surrogate viruses requires thorough investigation.

Purpose of the Study:

• To assess the safety of aerosolizing the Phi6 surrogate virus at high concentrations.
• To measure bacterial endotoxin levels in aerosolized Phi6 virus and its solutions.
• To evaluate the impact of purification methods on endotoxin levels.

Main Methods:

• Aerosolization of Phi6 surrogate virus at high concentration (PM2.5: ~1018 μg m⁻³).
• Measurement of bacterial endotoxin concentrations in virus solutions and room air.
• Assessment of endotoxin levels after traditional virus purification procedures.
• Monitoring of human participants for any adverse symptoms.

Main Results:

• High bacterial endotoxin levels (350 EU/ml) were present in the Phi6 solution, persisting after purification.
• Aerosolized bacterial endotoxins were detected below the occupational exposure limit (90 EU/m³).
• No symptoms were reported by participants using personal protective equipment (PPE).

Conclusions:

• While bacterial endotoxins were detected, aerosolized Phi6 at high concentrations appears safe for human research when PPE is used.
• Improved purification protocols are needed to reduce endotoxin levels in surrogate viruses.
• Further research should focus on enhancing the safety of surrogate viruses for indoor environment studies.