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Distribution of exposure sources among the 47 cases in the Americas with reported risks, 1945–2015
| Frequency | Percent | |
|---|---|---|
| Soil | 19 | 20 |
| Water | 7 | 7 |
| Soil and water | 16 | 17 |
| Animals | 2 | 2 |
| Sexual contact | 1 | 1 |
| In utero | 1 | 1 |
| Occupational exposure | 1 | 1 |
| Total | 47 | 100 |
