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Detection of Q fever infection in paired sera
| Test | No. positive (%)
|
|
|---|---|---|
| Acute-phase sera (S1) | Second sera (S2) | |
| IgM IFATa | 5/22 (23) | 22/22 (100) |
| IgM ELISA | 6/22b (27) | 22/22 (100) |
| CFT | 1/22 (5) | 22/22 (100) |
All paired sera showed at least a fourfold rise in titer by IgM IFAT.
One acute serum was IgM ELISA positive (ratio, 1.78) and IgM IFAT negative (ratio, <12).
