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Results of etiological examination
| Types of pathogens | Case numbers | Percentages (%) |
| Infection of C. sinensis only | 61 | 21.63 |
| Infection of C. sinensis and other pathogens | 97 | 34.40 |
| Infection of C. sinensis and other helminth | 32 | 11.35 |
| Infection of C. sinensis and hepatitis virus | 24 | 8.51 |
| Infection of C. sinensis, other helminth and hepatitis virus | 41 | 14.54 |
| Infection of hepatitis virus only | 92 | 32.62 |
| Neither with C. sinensis nor hepatitis virus | 32 | 11.35 |
| Totally | 282 | 100 |
