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Detection of Q fever in six paired sera
| Testa | No. positive (%)
|
|
|---|---|---|
| Acute-phase sera | Convalescent-phase sera | |
| CFT | 0/6 (0) | 6/6b (100) |
| IgG ELISA | 0/6 (0) | 3/6c (50) |
CFT cutoff, ≥4.0; ELISA cutoff, ≥1.0.
All paired sera showed a fourfold rise in antibody titer by CFT.
Three convalescent-phase sera showed ELISA seroconversion.
