Table 1.

Clinical features of the chronic Q fever patients.

Nr	Sex	Age (yrs)a	Focus of infection	IgG anti-phase I titrea,b	IgG anti-phase II titrea,b	PCR serum/ plasmaa	PCR tissue	Duration of antibiotic treatment (months)c
1	Male	30	Vascular graft	65536	65536	Pos	n.a.	0
2	Male	66	Aortic valve	131072	131072	Pos	Pos	1
3	Male	64	Aortic aneurysm	8192	8192	Neg	Pos	2
4	Male	46	Vascular graft	65536	131072	Pos	n.a.	7
5	Female	64	Aortic aneurysm	8192	8192	Pos	n.a.	18
6	Male	72	Vascular graft	16384	8192	Neg	Pos	9
7	Male	74	Aortic aneurysm	65536	32768	Neg	Pos	4
8	Female	54	Vascular graft	4096	4096	Neg	Pos	24
9	Male	79	Prosthetic aortic valve	4096	4096	Pos	n.a.	20
10	Male	58	Mitral valve	4096	8192	Pos	Pos	6
11	Male	67	Vascular graft	4096	4096	Neg	Pos	20
12	Female	65	Prosthetic aortic biovalve	8192	16384	Pos	n.a.	8
13	Male	71	Vascular graft	2048	4096	Pos	Pos	35
14	Male	59	Vascular graft	16384	8192	Pos	Pos	29
15	Male	74	Vascular/Spondylodiscitis	8192	8192	Neg	Pos	4

n.a., not available; ^aat the moment of diagnosis of chronic Q fever; ^bas measured with immunofluorescence assay (IFA, Focus Diagnostics); ^cat the moment of first blood sample for this study.