Table 2.
Model variables, distributions, and distribution parameters
| Model parameter | Description | Distribution | Distribution parameters |
|---|---|---|---|
|
| |||
| Ddiar | SARS-CoV-2 density in feces among infected individuals with diarrhea (log10 virus copies/mL) | Normal | (5.1, 0.76) |
| Vdiar | volume of feces per person per day among infected individuals with diarrhea (mL/day) | Normal | (1000, 100) |
| Fdiar | Fraction of infections with diarrhea (unitless) | Uniform | (0.2, 0.3) |
| Dnodiar | SARS-CoV-2 density in feces among infected individuals without diarrhea (log10 virus copies/g) | Normal | (4.067, 1.591) |
| Mnodiar | Mass of feces per person per day for infected individuals without diarrhea (g/day) | Lognormal | (4.84, 0.4) |
| Vww | Wastewater generated per person per day (L/day) | Lognormal | (5.397, 0.1595) |
| Tsewer | time wastewater spends in the sewer prior to reaching the wastewater treatment plant (h) | Lognormal | (1.2, 0.85) |
| Fshed | Fraction of infections resulting in shedding of viral RNA in feces (unitless) | Uniform | (0.6, 0.8) |
| Fcont | Volume fraction of wastewater coming from a source that could potentially be contributing to the observed reported influent SARS-CoV-2 concentration (unitless) | Uniform | (0.10, 0.85) |
| kvirus | Pseudo-first-order decay coefficient estimate for SARS-CoV-2 RNA target (day−1) | Point Estimate | 0.29 |
| kpMMoV | Pseudo-first-order decay coefficient estimate for PMMoV target (day−1) | Point Estimate | 0.29 |
| k_dSARS_CoV2 | SARS-CoV-2 Partitioning coefficient for conversion of settled solids density to wastewater influent density (unitless) | Point Estimate - Median | 900 |
| Point Estimate (lower, upper) | (280, 10,000) | ||
| k_d PMMoV | PMMoV Partitioning coefficient for conversion of settled solids density to wastewater influent density (unitless) | Point Estimate - Median | 2000 |
| Point Estimate (lower, upper) | (1000, 30,000) | ||
| DWW_endog | PMMoV density in feces (log10 virus copies/g) | Uniform from min-median; | (5.58, 8.28) |
| Uniform from median-max | (8.28, 9.99) | ||