TABLE 2.

Serum antibodies against GPL core antigen in patients with lung disease

Group	Titera
	IgG		IgA		IgM
	Mean ± SD	95% CI	Mean ± SD	95% CI	Mean ± SD	95% CI
MAC disease	0.281 ± 0.346	0.017-1.042	0.435 ± 0.385	0.051-1.599	0.714 ± 0.492	0.133-2.720
MAC colonization	0.026 ± 0.027*	0.005-0.104	0.021 ± 0.049*	0.006-0.143	0.164 ± 0.115*	0.038-0.472
M. kansasii disease	0.039 ± 0.015*	0.008-0.144	0.043 ± 0.054*	0.010-0.120	0.159 ± 0.131*	0.028-0.508
Tuberculosis	0.047 ± 0.031*	0.021-0.068	0.030 ± 0.018*	0.012-0.065	0.156 ± 0.113*	0.040-0.409
Healthy subjects	0.040 ± 0.028*	0.018-0.074	0.031 ± 0.042*	0.008-0.077	0.164 ± 0.092*	0.031-0.570

^aCI, confidence interval. *, statistically significant difference compared to patients with MAC disease (P < 0.0001).