Table 1

Gastrointestinal infection (GII) PCR test results on rectal swabs taken from men who have sex with men diagnosed with rectal Chlamydia trachomatis at selected STI clinics in the UK: prevalence with 95% CIs and association with selected patient characteristics (N=444)

	Shigella sp.			Campylobacter sp.			EAEC			Any GII
Variable*	PCR-+ve/ total tested (n/N)	Prevalence (%)±95% CI	p Value†	PCR-+ve/ total tested (n/N)	Prevalence (%)±95% CI	p Value†	PCR-+ve/ total tested (n/N)	Prevalence (%)±95 CI	p Value†	PCR-+ve/ total tested (n/N)	Prevalence (%)±95 CI	p Value†
Total	8/444	1.8 (0.9 to 3.6)		8/444	1.8 (0.9 to 3.6)		23/444	5.2 (3.5 to 7.7)		38/444	8.6 (6.3 to 11.6)
Region of UK residence
London	8/349	2.3 (1.2 to 4.5)	0.21	7/349	2.0 (1.0 to 4.2)	1.00	16/349	4.6 (2.9 to 7.4)	0.30	30/349	8.6 (6.1 to 12.1)	1.00
Outside London	0/95	0.0 (0.0 to 0.0)	0.21	1/95	1.1 (0.1 to 7.3)	1.00	7/95	7.4 (3.5 to 14.8)	0.30	8/95	8.4 (4.2 to 16.1)	1.00
Presence of symptoms
Yes	5/122	4.1 (1.7 to 9.6)	0.10	3/122	2.5 (0.8 to 7.5)	0.67	8/122	6.6 (3.3 to 12.7)	0.31	16/122	13.1 (8.1 to 20.5)	0.05
No	2/220	0.9 (0.2 to 3.6)	0.10	3/220	1.4 (0.4 to 4.2)	0.67	9/220	4.1 (2.1 to 7.7)	0.31	14/220	6.4 (3.8 to 10.4)	0.05
HIV status
Positive	6/127	4.7 (2.1 to 10.2)	0.01	4/127	3.2 (1.2 to 8.2)	0.20	6/127	4.7 (2.1 to 10.2)	1.00	16/127	12.6 (7.8 to 19.7)	0.05
Negative	1/222	0.5 (0.1 to 3.2)		2/222	0.9 (0.2 to 3.6)		11/222	5.0 (2.8 to 8.8)		14/222	6.3 (3.8 to 10.4)	0.05
LGV status
Positive	1/51	2.0 (0.3 to 13.4)	0.58	1/51	2.0 (0.3 to 13.4)	1.00	3/51	5.9 (1.8 to 17.3)	0.72	4/51	7.8 (2.9 to 19.7)	1.00
Negative	5/332	1.5 (0.6 to 3.6)	0.58	7/332	2.1 (1.0 to 4.4)	1.00	15/332	4.5 (2.7 to 7.4)	0.72	27/332	8.1 (5.6 to 11.6)	1.00

*Includes specimens with known variable information only.
†Fisher's exact test.
EAEC, enteroaggregative E. coli; LGV, Lymphogranuloma venereum; PCR-+ve, PCR test positive result.