COVID-19 infection was associated with an increased risk of six newly diagnosed allergic conditions in a retrospective cohort study of children and adults aged 1–64 years. The findings highlighted a potential allergic disease burden following infection, with different patterns observed in children and active-duty service members.
Researchers conducted a retrospective cohort study using 1:2 propensity score matching to evaluate the association between COVID-19 exposure and the development of allergic conditions over 18 months. The outcomes were atopic dermatitis, asthma, food allergy, rhinoconjunctivitis, medication allergy, and urticaria.
The analysis focused on incident conditions, examining new diagnoses during follow-up. Researchers calculated hazard ratios for each outcome across the full cohort and conducted separate analyses in children and active-duty service members. These subgroup analyses examined whether the associations observed across the study population were also present in these groups.
In the full cohort, COVID-19 infection was associated with significantly increased hazard ratios for all six allergic conditions. The findings therefore extended across respiratory, skin, food, and medication-related outcomes rather than being confined to a single diagnosis.
Among active-duty service members, statistically significant associations were observed for asthma and rhinoconjunctivitis. In children, infection was significantly associated with five of the six conditions, with food allergy being the exception.
Higher sponsor rank, assessed as a potential surrogate for socioeconomic status, was associated with a slightly lower risk of developing asthma. This association provided an additional finding concerning socioeconomic circumstances, although sponsor rank represented a proxy measure.
The findings added to evidence of an association between COVID-19 infection and subsequent allergic disease in both children and adults. The authors emphasised the potential public health burden and the importance of monitoring for allergic conditions after infection to support prompt intervention.
They also suggested a possible mechanistic link between COVID-19 and type two inflammation. However, the retrospective observational design means that the reported associations do not establish causation or confirm the proposed inflammatory mechanism.
Reference:
Clarion J et al. Post–COVID-19 onset of allergic conditions in a propensity-matched cohort of children and adults. Ann Allergy Asthma Immunol. 2026;137(2):185–193.e2.
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