Table 3.

Interpretation of C. burnetiiserology resultsa

Form of diseaseMicroimmunofluorescence assay inverse titerComplement fixation assay titer
Anti-phase IIAnti-phase IAnti-phase IIAnti-phase I
IgGIgMIgAIgGIgMIgA
Acute40020050502000≥1:400
Acute4001000000
Treated40000200001:10
Treated1000010000
Chronic3,20008003,2000800≥1:200≥1:200
Chronic6,4008004006,400800400
  • a The titers reported here are characteristic examples of the antibody responses observed during Q fever.