The proportion of the genital biopsy sequences with the nearest neighbor sequence originating from the genital tract.

aPair-wise distance were used to identify whether the nearest neighbor to each genital DNA sequence was another genital sequence or from blood, as described in materials and methods. The actual proportion indicates the proportion of genital DNA sequences that had a nearest neighbor that is also from the genital tract; generalized estimating equations (GEE) was used to obtain confidence intervals for the actual proportion. The expected proportion indicates the proportion of sequences that would be matched with a genital tract sequence, under the assumption of random matching.