Table 1 Causes of fever unknown origin.
From: Fever of unknown origin in China: evaluation of 918 cases during a ten-year-period of study
| Diagnostic category | number of patients (n =918) | % |
| Infection | 358 | 38.9 |
| Collagen vascular disease | 298 | 32.5 |
| Neoplasm | 120 | 13.1 |
| Miscellaneous | 82 | 8.9 |
| No diagnosis | 60 | 6.5 |