Table 2. Antibody levels against Msg, San Francisco General Hospital staff, San Francisco, California, USA, 2007–2009*†.

Antibody	Occupation, estimated geometric mean (95% CI)			p value
	Clinical, n = 396	Nonclinical, n = 80
MsgA	12.0 (11.1–12.9)	18.4 (17.1–19.9)		0.45
MsgB	4.9 (4.6–5.1)	6.7 (6.3–7.1)		0.56
MsgC1	38.4 (35.9–41.1)	19.8 (18.6–21.2)		0.004
MsgC3	77.1 (71.9–82.7)	52.9 (49.4–56.8)		0.09
MsgC8	46.0 (42.9–49.2)	27.6 (25.8–29.6)		0.02
MsgC9	34.6 (32.7–36.6)	27.0 (25.5–28.5)		0.17

*Msg, major surface glycoprotein.
†By occupation for all time points and for all participants, adjusted for age and immune disorder,