Table 3.

Comparison of Antibodies against C. trachomatis Serovars A, B, C, and D; C. psittaci; and C. pneumoniae

Student'st-Test (mean ± SD) (n = 122)		C. trachomatis				C. psittaci	C. pneumoniae
		Serovar A	Serovar B	Serovar C	Serovar D	6BC	AR39
C. trachomatis	Serovar A (23,043.4 ± 42,671.8)	1	0.5468	0.0088	0.0015	<0.0001	0.0567
	Serovar B (20,162.3 ± 30,988.4)		1	0.0123	0.0011	<0.0001	0.0039
	Serovar C (11,892.6 ± 18,755.8)			1	0.3446	0.0006	<0.0001
	Serovar D (9810.7 ± 15,422.8)				1	0.0067	<0.0001
C. psittaci	6BC (5485.2 ± 8214.4)					1	<0.0001
C. pneumo-niae	AR39 (32,759.0 ± 36,340.3)						1

The antibodies against different chlamydial organisms were compared against each other using ANOVA (data not shown) and Student's t-test. The titers of anti–C. trachomatis serovar A or B antibodies in the 122 subjects are significantly higher than those of anti–C. trachomatis serovar C or D, suggesting that these 122 individuals were mainly infected with ocular serovars A and B. The titers of antibodies against C. psittaci are the lowest, whereas those of anti–C. pneumoniae antibodies were highest in the same 122 individuals, which both confirms that the titers of antibodies detected in the assay were not caused by cross-reactivity and indicates that most of the 122 individuals were also coinfected with C. pneumoniae but not C. psittaci.