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Cutoff proposal for Q fever diagnosis by using microimmunofluorescence and interpretation of serological results obtained with a single serum sample
| Phase II antibody titer
|
Phase I antibody titer (IgG) | Interpretation | |
|---|---|---|---|
| IgG | IgM | ||
| ≤100 | Active Q fever improbable | ||
| ≥200 | ≥50 | Acute Q fever (100% predictive) | |
| ≥1:800 | Chronic Q fever (98% predictive) | ||
| ≥1:1,600 | Chronic Q fever (100% predictive) | ||
