Fig. 3.

Minimum-spanning tree using the modified C. trachomatis MLST method with samples from 18 putative couples. The coding is by couple number and gender (♂, male; ♀, female). Genovars (ompA) are indicated with letters within the tree, and nodes with identical patterns indicate identical genovars. The sizes of the nodes indicate the number of samples included (1 to 8). The length of the branch indicates the number of alleles shared between connected sequence types (1 to 5). When multiple samples are available for one person, the number of included samples is given in parentheses. It can be seen that the partners of couple 18 do not share the same strain of Chlamydia trachomatis.