TABLE 4.
QMRA laundry single user event scenarios
| Event tree—nonenveloped, respiratory virus, rhinovirus | Wash | Detergent | Other | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Original concentration | Die‐off during hamper storage | Cold | Hot | Regular | Advanced | Machine dry/cold wash | Chlorine bleach rinse/cold wash | Machine dry/hot wash | Chlorine bleach rinse/hot wash |
| 1.00E+07 | 3.16E+02 | 3.16E‐02 | 3.16E‐02 | 3.16E‐04 | 1.26E‐04 | 3.16E‐03 | 3.16E‐08 | 3.16E‐03 | 3.16E‐08 |
| Transfer to hands | 5.22E+00 | 5.22E‐04 | 5.22E‐04 | 5.22E‐06 | 2.08E‐06 | 5.22E‐05 | 5.22E‐10 | 5.22E‐05 | 5.22E‐10 |
| Transfer to face/orifice | 1.77E+00 | 1.77E‐04 | 1.77E‐04 | 1.77E‐06 | 7.04E‐07 | 1.77E‐05 | 1.77E‐10 | 1.77E‐05 | 1.77E‐10 |
| Dose concentration | 1.77E+00 | 1.77E‐04 | 1.77E‐04 | 1.77E‐06 | 7.04E‐07 | 1.77E‐05 | 1.77E‐10 | 1.77E‐05 | 1.77E‐10 |
| Infection risk (single event) | 1.40E‐01 | 2.16E‐05 | 2.16E‐05 | 2.16E‐07 | 8.60E‐08 | 2.16E‐06 | 2.16E‐11 | 2.16E‐06 | 2.16E‐11 |
| Transfer to face/orifice w/hand hygiene intervention | 1.77E‐06 | 1.77E‐10 | 1.77E‐10 | 1.77E‐12 | 7.04E‐13 | 1.77E‐11 | 1.77E‐16 | 1.77E‐11 | 1.77E‐16 |
| Dose concentration w/hand hygiene intervention | 1.77E‐06 | 1.77E‐10 | 1.77E‐10 | 1.77E‐12 | 7.04E‐13 | 1.77E‐11 | 1.77E‐16 | 1.77E‐11 | 1.77E‐16 |
| Infection risk w/hand hygiene intervention | 2.16E‐07 | 2.16E‐11 | 2.16E‐11 | 2.16E‐13 | 8.59E‐14 | 2.16E‐12 | 0.00E+00 | 2.16E‐12 | 0.00E+00 |
| Event tree—nonenveloped enteric virus, rotavirus | Wash | Detergent | Other | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Original concentration | Die‐off during hamper storage | Cold | Hot | Regular | Advanced | Machine dry/cold wash | Chlorine bleach rinse/cold wash | Machine dry/hot wash | Chlorine bleach rinse/hot wash |
| 1.00E+11 | 1.00E+11 | 1.32E+08 | 2.51E+05 | 1.78E+09 | 3.72E+05 | 6.31E+07 | 3.98E+03 | 1.20E+05 | 7.59E+00 |
| Transfer to hands | 1.65E+09 | 2.18E+06 | 4.14E+03 | 2.93E+07 | 6.13E+03 | 1.04E+06 | 6.57E+01 | 1.98E+03 | 1.25E‐01 |
| Transfer to face/orifice | 5.59E+08 | 7.37E+05 | 1.41E+03 | 9.95E+06 | 2.08E+03 | 3.53E+05 | 2.23E+01 | 6.72E+02 | 4.24E‐02 |
| Dose concentration | 5.59E+08 | 7.37E+05 | 1.41E+03 | 9.95E+06 | 2.08E+03 | 3.53E+05 | 2.23E+01 | 6.72E+02 | 4.24E‐02 |
| Infection risk (single event) | 9.90E‐01 | 9.48E‐01 | 7.47E‐01 | 9.73E‐01 | 7.71E‐01 | 9.37E‐01 | 3.21E‐01 | 6.96E‐01 | 1.73E‐03 |
| Transfer to face/orifice w/hand hygiene intervention | 1.41E+04 | 1.85E+01 | 3.53E‐02 | 2.50E+02 | 5.22E‐02 | 8.87E+00 | 5.59E‐04 | 1.69E‐02 | 1.07E‐06 |
| Dose concentration w/hand hygiene intervention | 1.41E+04 | 1.85E+01 | 3.53E‐02 | 2.50E+02 | 5.22E‐02 | 8.87E+00 | 5.59E‐04 | 1.69E‐02 | 1.07E‐06 |
| Infection risk w/hand hygiene intervention | 8.59E‐01 | 2.96E‐01 | 1.44E‐03 | 6.10E‐01 | 2.13E‐03 | 2.02E‐01 | 2.29E‐05 | 6.91E‐04 | 4.37E‐08 |
| Event tree—enteric bacteria, Salmonella spp. | Wash | Detergent | Other | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Original concentration | Die‐off during hamper storage | Cold | Hot | Regular | Advanced | Machine dry/cold wash | Chlorine bleach rinse/cold wash | Machine dry/hot wash | Chlorine bleach rinse/hot wash |
| 1.00E+10 | 1.00E+10 | 7.94E+07 | 3.98E+03 | 1.12E+09 | 1.00E+07 | 1.17E+03 | 7.94E+03 | 5.89E‐02 | 3.98E‐01 |
| Transfer to hands | 1.65E+08 | 1.31E+06 | 6.57E+01 | 1.85E+07 | 1.65E+05 | 1.94E+01 | 1.31E+02 | 9.72E‐04 | 6.57E‐03 |
| Transfer to face/orifice | 5.59E+07 | 4.44E+05 | 2.23E+01 | 6.28E+06 | 5.59E+04 | 6.57E+00 | 4.44E+01 | 3.29E‐04 | 2.23E‐03 |
| Dose concentration | 5.59E+07 | 4.44E+05 | 2.23E+01 | 6.28E+06 | 5.59E+04 | 6.57E+00 | 4.44E+01 | 3.29E‐04 | 2.23E‐03 |
| Infection risk (single event) | 9.46E‐01 | 8.52E‐01 | 7.47E‐02 | 9.15E‐01 | 7.71E‐01 | 2.57E‐02 | 1.25E‐01 | 1.39E‐06 | 9.39E‐06 |
| Transfer to face/orifice w/hand hygiene intervention | 1.12E+03 | 8.87E+00 | 4.44E‐04 | 1.25E+02 | 1.12E+00 | 1.31E‐04 | 8.87E‐04 | 6.57E‐09 | 4.44E‐08 |
| Dose concentration w/hand hygiene intervention | 1.12E+03 | 8.87E+00 | 4.44E‐04 | 1.25E+02 | 1.12E+00 | 1.31E‐04 | 8.87E‐04 | 6.57E‐09 | 4.44E‐08 |
| Infection risk w/hand hygiene intervention | 4.84E‐01 | 3.38E‐02 | 1.87E‐06 | 2.32E‐01 | 4.64E‐03 | 5.53E‐07 | 3.74E‐06 | 2.77E‐11 | 1.87E‐10 |
meets acceptable risk threshold of ≥1.0 × 10−4; 
meets acceptable risk threshold of ≥1.0 × 10−6.