Antibiotic Allergy Testing De-labels Most Children

MOST CHILDREN labelled as allergic to beta-lactam antibiotics are not confirmed to be hypersensitive when formally evaluated.

A new study has found that direct oral drug provocation testing (DPT) safely de-labelled the majority of children with suspected beta-lactam allergy, including those with carefully selected mild immediate and delayed reactions.

Direct Testing Bypasses the Skin-Test Step

Beta-lactam antibiotics (penicillins, cephalosporins, carbapenems, and monobactams) are commonly implicated in suspected hypersensitivity reactions among children.

However, many self-reported beta-lactam allergies may instead be viral exanthems or antibiotic side effects.

An allergy label acquired in childhood can persist for years, potentially restricting access to first-line antibiotics and leading to use of broader-spectrum alternatives, contributing to anti-biotic resistance.

International guidelines have recommended DPT, giving the child the suspected antibiotic under medical supervision without preceding skin testing for children with mild, delayed hypersensitivity reactions.

The approach can simplify assessment and reduce reliance on skin testing in appropriately selected patients.

What has been less clear is whether the same direct approach is safe in children with mild immediate reactions, and whether evidence from predominantly Western cohorts translates to Asian paediatric populations, where data have been more limited.

A Singapore Cohort Puts the Approach to the Test

Researchers from Ministry of Health Holdings and the Allergy Service at KK Women’s and Children’s Hospital in Singapore, retrospectively reviewed 395 children who underwent 425 beta-lactam DPTs for suspected beta-lactam hypersensitivity reactions, with or without preceding skin testing.

Among diagnostic direct oral DPTs to the index beta-lactam, 89.3% were passed successfully, allowing the children to be de-labelled.

Of the reactions that occurred during diagnostic direct oral DPTs, 88.9% were mild cutaneous reactions. Three cases (8.3%) involved cytokine release syndrome, and one case (2.8%) involved anaphylaxis. A younger age at the time of the original reaction was the only statistically significant factor associated with passing a diagnostic direct oral DPT.

Direct Testing Was Safe in Carefully Selected Children

The researchers concluded that direct oral DPT was a safe method for de-labelling beta-lactam allergy in children with both mild immediate and delayed hypersensitivity reactions.

The findings support consideration of direct DPT in carefully selected children with mild immediate or delayed reaction histories, potentially reducing the need for preceding skin testing.

However, the researchers warn that as this was a retrospective cohort study from Singapore, and the findings should not be interpreted as supporting direct challenge in children with severe immediate reactions, previous severe cutaneous adverse reactions or other high-risk histories.

Overall, however, the study adds important evidence from an Asian paediatric population to the growing literature on risk-stratified beta-lactam allergy evaluation and suggests that, in appropriately selected children, direct DPT may be a useful approach to reducing unnecessary beta-lactam allergy labels.

Reference

Ng WCE, et al. Evaluation of diagnostic approach and clinical outcomes in children with suspected beta-lactam allergy. Asian Pac J Allergy Immunol. 2026

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