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| Population | Single Clones | Unique Haplotypes Only | ||
| No. | IAS | No. | IAS | |
| 1994–2000 | 47 | 0.529*** | 19 | 0.346*** |
| 2001–2008 | 40 | 0.218*** | 27 | 0.173*** |
Single clones show all haplotypes in single-clone infections. Unique haplotypes show haplotypes excluding duplicates of any multiply represented infection. No. indicates the number of isolates for each measure.
***: P<0.001.
