Table 2.
Test Results of IHC, Culture, PCR, and Serology
| Case number/status* | IHC | Culture | PCR | Serology |
|---|---|---|---|---|
| 1/Confirmed | Positive | Negative (nasal and wound swab) | Negative (serum, swab, formalin-fixed skin biopsy) | Reactive |
| 2/Confirmed | Positive | Negative (blood and wound swab) | Positive (one of eight blood samples) Negative (formalin-fixed skin biopsy) | NA |
| 3/Confirmed | Positive | Negative (serum) | Negative (serum and frozen skin biopsy) | Reactive |
| 4/Confirmed | Positive | Negative (blood) | Positive (formalin-fixed skin biopsy) Negative (blood and serum) | Reactive |
| 5/Confirmed | Positive | Positive (blood) Negative (nasal swab and fresh skin); Staphylococcus species (wound) | Negative (frozen skin biopsy) | Reactive |
| 6/Suspect | Positive | Negative (blood and wound swab) | Negative (blood and frozen skin biopsy) | Negative |
| 7/Confirmed | Positive | Negative (blood, wound swab, and fresh skin) | Positive (frozen skin biopsy) Negative (serum) | Reactive |
| 8/Confirmed | Positive | Positive (wound swab) Negative (blood and fresh skin) | Negative (serum and frozen skin biopsy) | Reactive |
| 9/Suspect | Negative† | Negative (blood, serum, and nasal swab) | Negative (blood, serum, nasal swab, and formalin-fixed skin biopsy) | Reactive |
| 10/Suspect | Negative‡ | NA | Negative (serum and frozen skin biopsy) | Reactive |
NA, not available.
*Case definition and status are described in the Methods section. One suspect case was excluded because skin biopsy was unavailable for pathologic evaluation.
†Patients had multiple lesions (cheek, buttock, thigh, and lower leg); the biopsy was taken from left thigh unrelated to the primary lesion in the cheek.
‡Contained a small, superficial, shave biopsy that was inadequate for pathologic evaluation.