| 1 | For fatal cases, the course of illness takes an average of two days. | |
| 2 | The drugs can shorten the length of the disease and its severity. | |
| 3 | The drugs can shorten the length of the disease and its severity. | |
| 4 | I've been told that I have a chronic illness, which has a lifelong course. | |
| 5 | They are of long duration and generally slow progression. |