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Comparison of Q fever IgG ELISA ratios with CFT titers in sera for prevaccination screening (A) and investigation of Q fever infection (B). Mean ELISA ratios are shown by horizontal bars. The cutoff values (ratio = 1.0) are shown by broken lines. Note that in panel A two sera that had CFT titers of <2.5 had IFAT titers of ≥10 and that in panel B one serum sample that had a CFT titer of <4.0 had an IFAT titer of ≥10. pos, positive.
