TABLE 3.

Interpretation of C. burnetii serology results^a

Form of disease	Microimmunofluorescence assay inverse titer						Complement fixation assay titer
	Anti-phase II			Anti-phase I			Anti-phase II	Anti-phase I
	IgG	IgM	IgA	IgG	IgM	IgA
Acute	400	200	50	50	200	0	≥1:40	0
Acute	400	100	0	0	0	0
Treated	400	0	0	200	0	0	1:1	0
Treated	100	0	0	100	0	0
Chronic	3,200	0	800	3,200	0	800	≥1:200	≥1:200
Chronic	6,400	800	400	6,400	800	400

^aThe titers reported here are characteristic examples of the antibody responses observed during Q fever.