Table 4  Survival parameters: this is a list of parameters that are uniformly modulated and the direction in which they change when survival is increased or decreased. An up arrow (↑) indicates the parameter is increased by some percent when the equivalent (percent) change in survival is applied. A down arrow (↓) indicates the parameter is decreased by some percent when the equivalent (percent) change in survival is applied.
Symbols  Definition  Survival Increased  Survival Decreased
k  Waning virus rate in environment (using the average of all material values, wood, steal, cardboard, and plastic)  ↓  ↑
βW  Contact rate of person with environment × transmission probability of environment to people  ↑  ↓