January 18, 2021

Ozone kills coronavirus in PPE under certain conditions

A doctor assists a patient with coronavirus

A doctor assists a patient with coronavirus

The project Use of ozone for the reuse of special protective equipment (PPE), in which the University of La Laguna (ULL), has revealed that oxidative stress induced by ozone exposure eliminated the SARS-CoV-2 virus in different PPE in certain exposure times, concentrations and relative humidity conditions.

As reported by the ULL this Tuesday in a statement, the Canary Islands Institute of Tropical Diseases and Public Health, belonging to the center, is part of the consortium of several Canary Islands health entities that developed the study, whose results have been published in the journal Antioxidants.

The researchers contaminated different PPE with an inactivated strain of the coronavirus, treated them with different concentrations of ozone, exposure times and relative humidity conditions, and then evaluated by PCR the presence or absence of the 3 SARS-CoV-2 genes in real time.

The study did not detect the virus in EPI after exposure to ozone for 30 seconds and 10,000 ppm (20 grams per cubic meter) for 5 minutes at 4,000 ppm and 10 minutes at 2,000 ppm. At lower ozone concentrations, 4 to 12 ppm (0.008 to 0.024 g / m3) the effects were highly dependent on the relative humidity conditions.

The researchers therefore concluded that oxidative stress induced by ozone exposure eliminated SARS-CoV-2 in different PPE under appropriate exposure times, ozone concentrations, and relative humidity conditions.

Some findings that could contribute to decrease the risk of contamination of personal protective equipment and increase its availability “in periods of stock breakage”, as already happened in April this year, the ULL has reported.

The next step of the project will include studies using infectious clinical strains of SARS-CoV-2.


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