Table 1 Model parameters and their values
Parameter | Value | |
|---|---|---|
Shedding parameters: | ||
Shedding (air dispersal) rate (cfu/cm2/min) | α | 0.01 |
Survival parameters: | ||
Die-off rate on skin and hand (min-1) | μsk | 0.00353 |
Die-off rate on porous surface (min-1) | μp | 0.000632 |
Die-off rate on nonporous surface (min-1) | μnp | 0.0002 |
Contact parameters: | ||
Rate of patient touching surfaces (min-1) | τpt-sf | 0.134 |
Rate of HCW touching patient (min-1) | τhcw-pt | 0.4 |
Rate of HCW touching surfaces (min-1) | τhcw-sf | 0.4 |
Rate of touching the nose (min-1) | τn | 0.025 |
Rate of HCW wiping nonporous surface (min-1) | ωnp | 0.4 |
Transfer efficiency parameters: | ||
Transfer efficiency from porous surface to hand | ρp | 0.1 |
Transfer efficiency from nonporous surface to hand | ρnp | 0.4 |
Transfer efficiency from hand to skin | ρsk | 0.35 |
Transfer efficiency from fingertip to nose | ρn | 0.2 |
Surface area parameters: | ||
Total exposed skin and hand surface area of patients (cm2) | Apt | 2000 |
Total exposed skin and hand surface area of HCWs (cm2) | Ahcw | 2000 |
Total porous surface area (cm2) | Ap | 2000 |
Total nonporous surface area (cm2) | Anp | 2000 |
Nose surface area (cm2) | An | 4 |
Hand contact surface area (cm2) | Ah | 150 |
Fingertip contact surface area (cm2) | Af | 1 |
Interventions: | ||
Daily surface decontamination efficacy | ϵd | 0, 50, 100% |
Wiping efficacy | ϵw | 0, 50, 100% |