However , rodent droppings or urine of indeterminate age should always be treated as infectious .
The viruses have been demonstrated to remain active for two to three days at normal room temperature , while ultraviolet rays in direct sunlight kills them within a few hours .
Rodent droppings or urine of indeterminate age should always be treated as infectious .
The viruses have been demonstrated to remain active for two to three days at normal room temperature , while ultraviolet rays in direct sunlight kills them within a few hours .