TABLE 2.

Differences between MSM and heterosexuals in C. trachomatis genotypes and population structures

Parameter	MSM populationa	Heterosexual population
Most predominant ompA genovars	D (26%, n = 160)	D (12%, n = 170); P < 0.001 for the five serotypes
	E (5%, n = 29)	E (45%, n = 617)
	G (29%, n = 179)	G (10%, n = 134)
	F (4%, n = 22)	F (16%, n = 215)
	J (14%, n = 85)	J (4%, n = 53)
No. clustersb	A few large clusters	Multiple clusters of various size
Overlap with clusters in the other risk groupc	Almost absent	A small proportion
Subpopulations within clusters	No	Ethnicityd
Geographic variation within clusters	No	Yese

^aompA data missing for 4 MSM.

^bSee Fig. 1B.

^cClusters in MST analysis with specimens from MSM (red in Fig. 1B) have almost no specimens from the suggested heterosexuals, while in clusters predominated by heterosexuals (blue), a smaller proportion of specimens come from MSM.

^dExemplified by studies described in references 18 and 20.

^eSee Fig. 1C.