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Historical O. viverrini prevalence in the four geographical regions of Thailand. The reported prevalences are based on Sithitaworn et al. 2012a and Jongsuksuntigul and Imsomboon, 2003 reviews of Thai National Surveys.
| Region | Prevalence (%) | |||
|---|---|---|---|---|
| 1981 | 1991 | 2001 | 2009 | |
| North | 5.6 | 22.9 | 29.7 | 10 |
| North East | 34.6 | 24.1 | 15.7 | 21.3 |
| Central | 6.3 | 7.3 | 3.8 | 1.3 |
| South | 0.11 | 0.3 | 0.1 | 0.1 |
|
| ||||
| Overall | 11.6 | 13.6 | 12.3 | 8.2 |
