Table 3.
UV dose required for 3-log inactivation of SARS-CoV-2 variants.
| # | Virus/variant | UV source | Conditions | Dose needed for a 3-log reduction | References |
|---|---|---|---|---|---|
| 1 | SARS-CoV-2: w.t. (Wuhan strain), alpha (B.1.1.7 501Y.V1), delta (B.1.617.2), omicron (B.1.1.529) | UV-LED 267 nm | Suspension | 2–5 mJ/cm2 | This study |
| 2 | hCoV-OC43 | UV-LED (267, 275, 285. 295 nm) | Suspension | 5.6–32 mJ/cm2, wavelength-dependent | 1 |
| 3 | SARS-CoV-2 Isolate USA-WA1/2020 | LP-UV (254 nm) | Aerosol | Not available | 7 |
| 4 | SARS-CoV-2 clade 20A (lineage B.1) | LP-UV (254 nm) | Suspension | 14.5 for polystyrene surface and 9.8 mJ/cm2 for glass and stainless steel | 6 |
| 5 | SARS-CoV-2 USA-WA1/2020 | Pulsed xenon ultraviolet (200–320 nm) | Suspension dried on surface and on N95 masks | Not available | 5 |
| 6 | SARS-CoV-2 SB3-TYAGNC, HCoV-229E, HCoV-OC43, Others | LP-UV (254 nm) | Suspension | 7.5 mJ/cm2 | 4 |
| 7 | SARS-CoV-2 UT-NCGM02/Human/2020/Tokyo | UV-LED 265 nm | Suspension and Aerosol. 1% protein (bovine serum albumin) added | 8.3 and 1 mJ/cm2 for suspension and aerosol respectively | 8 |
| 8 | SARS-CoV-2 (isolate USA WA1 2020) | KrCl (222 nm), LP-UV (254 nm), UV-LEDs (270 and 282 nm) | Suspension | 2.5, 2.2, 3.3, and 6 mJ/cm2, with the different irradiation sources | 2 |