What is the risk of using a cephalosporin in a patient with a penicillin allergy?
Bibliographic record
Abstract
suggested that the absolute risk of an allergic reaction to cephalosporins in an individual allergy to penicillin is actually very low and the risk of severe consequences of an allergic reaction is even lower. Anaphylaxis occurred in less than 0.001% of patients taking a cephalosporin who had a previous history of a penicillin allergy. This same study by Apter et al (5) also demonstrated that the relative risk of a reaction in a patient with a penicillin allergy, who subsequently takes a cephalosporin, is increased compared with individuals who received cephalosporin with no prior history of a penicillin allergy (unadjusted RR = 10.0; CI 7.4 to 13.6), with 1.1% of patients having events after both penicillin and cephalosporin. However, there was a similarly increased risk when the penicillin-allergic patient was given a sulfonamide as the second medication when compared with those who received sulfonamide without a history of penicillin allergy (unadjusted RR = 7.2; CI 3.8 to 13.5), with 1.6% of patients having events after both penicillin and sulfonamide. As a result, Apter et al (5) concluded that cross-reactivity could not fully explain these results, and because the risk of very severe reactions in their study was low, they believed that cephalosporins could be considered for treatment of patients with a penicillin allergy. There is also evidence to support that certain cephalosporins are more likely than others to cross-react with penicillin. Atanaskovic-Markovic et al (4) demonstrated that cross-reactivity between cephalosporins and penicillins depends on the generation of cephalosporins with cross-reactivity being higher with earlier generation of cephalosporins, and varying between 0.3% and 23.9%. Pichichero (1), in a recent review of the evidence, stated that because the degradation process of the beta-lactam rings is different for penicillins than it is for cephalosporins, the similarity in structure of the beta-lactam rings as a predictor of cross-reactivity may be less important than once thought. Pichichero also cited that evidence is growing to support the idea that a cephalosporin’s ability to generate an immune response is linked to the chemical structure of its side chain. He concluded that medications with similarly structured side chains may be more likely to cross-react than
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".