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. 2011 Mar;17(3):350–356. doi: 10.3201/eid1703.100882

Table 2. PPV of Q fever phase I IgG titers for patients with endocarditis, France, 2009*.

Characteristic Titers
>800 >1,600 >3,200 >6,400
No. with definite endocarditis 41 32 24 17
No. with possible endocarditis 11 9 3 1
Total 141 88 47 24
PPV, % (definite or possible endocarditis) 37 59 57 75

*PPV, positive predictive value; phase I, virulent bacteria; Ig, immunoglobulin.