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Number of wild-type measles viruses in 2004 by province.
| Class* | Province | No. of isolates | Genotype | |
| H1 | ||||
| cluster1 | cluster2 | |||
| A | Guangdong | 1 | 1 | 0 |
| Liaoning | 5 | 5 | 0 | |
| Shanxi | 12 | 12 | 0 | |
| Tianjin | 5 | 5 | 0 | |
| Anhui | 2 | 2 | 0 | |
| Hebei | 2 | 1 | 1 | |
| Shanghai | 2 | 2 | 0 | |
| Shandong | 2 | 2 | 0 | |
| B | Chongqing | 5 | 5 | 0 |
| Guizhou | 4 | 1 | 3 | |
| Qinghai | 2 | 2 | 0 | |
| Xinjiang | 3 | 2 | 1 | |
| Yunnan | 2 | 0 | 2 | |
| Gansu | 2 | 2 | 0 | |
| Sichuan | 8 | 7 | 1 | |
| Ningxia | 2 | 2 | 0 | |
| total | 59 | 51 | 8 | |
Epidemiologic classification of each province is shown
* See definition of epidemiologic class in the text
