Table 2.
Participants with positive intra-dermal skin tests
| Sex | Age (years) | Delay since reaction (years) | Culprit drug | BP (mm) | PPL (mm) | NS (mm) | DPT | |
|---|---|---|---|---|---|---|---|---|
| IU/mL | ||||||||
| 104 | 103 | |||||||
| True positive | ||||||||
| F | 8 | 0.7 | AXO | 5 | – | – | – | Urticaria and angioedema < 1 h post-DPT |
| False positives | ||||||||
| M | 5 | 1.3 | AXO | 8 | – | – | – | – |
| M | 2 | 0.6 | AXO | 7 | – | – | – | – |
| F | 5 | 1.0 | AXO | 6 | – | – | – | – |
| F | 10 | 9.2 | AXO | 5 | – | – | – | – |
| M | 11 | 5.7 | AXO | 4 | – | – | – | – |
| M | 2 | 0.5 | AXO | 7 | – | – | – | – |
| M | 2 | 0.7 | AXO | 4 | – | – | – | – |
| M | 3 | 1.8 | AXO | 7 | – | – | – | – |
| M | 2 | 0.5 | AXO | 8 | 4 | – | – | – |
| M | 11 | 6.3 | AXO | 6 | 9 | – | – | – |
| F | 18 | 17.6 | AXO | 3 | 3 | 5 | – | – |
| F | 13 | 11.6 | AXO | 10 | – | 8 | 5 | – |
| F | 2 | 1.0 | CLAV | – | 3 | 4 | – | – |
| M | 17 | 11.3 | AXO | – | – | 5 | – | – |
| M | 2 | 0.2 | AXO | – | – | 7 | – | – |
| False negatives | ||||||||
| F | 2 | 0.4 | AXO | – | – | – | – | Urticaria < 1 h post-DPT |
| M | 2 | 0.5 | AXO | – | – | – | – | Urticaria < 1 h post-DPT |
| F | 3 | 1.8 | AXO | – | – | – | – | Urticaria at 24 h post-DPT |
| F | 2 | 0.7 | AXO | – | – | – | – | Urticaria at 12 h post-DPT |
BP benzylpenicillin, PPL penicilloyl-polylysine, NS normal saline, DPT drug provocation test, MDM; AXO amoxicillin, CLAV amoxicillin + clavulinic acid