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Systematic review and meta-analysis shows moderate correlation between S. aureus colonization and atopic dermatitis severityStaph bacteria linked to worse eczema symptoms in patients

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Key Takeaway
Note moderate correlation between S. aureus colonization and AD severity in this meta-analysis.

This systematic review and meta-analysis evaluated the association between Staphylococcus aureus colonization and atopic dermatitis severity across 929 participants. The study setting was not reported, and follow-up duration was not reported. The primary outcome measured the correlation between bacterial colonization and disease severity.

The analysis revealed a moderate positive correlation with an effect size of r = 0.42. The 95% confidence interval for this correlation ranged from 0.31 to 0.52. No specific medications were evaluated in this review. Secondary outcomes were not reported.

Limitations included moderate heterogeneity with an I-squared value of 38%. Adverse events, serious adverse events, discontinuations, and tolerability were not reported. Funding or conflicts of interest were not reported. The authors explicitly state that these results should not be interpreted as evidence of a direct causal relationship.

Practice relevance was not reported. The certainty of the evidence was not reported. Clinicians should interpret these pooled estimates with caution given the observational nature of the underlying data and the lack of reported safety information.

A new review looked at 929 people with eczema to see if having staph bacteria on their skin made their condition worse. The study found a moderate link between the amount of staph bacteria and how severe the eczema symptoms were. This means that people with more staph bacteria tended to have worse eczema.

The researchers used data from several smaller studies to reach this conclusion. They found a clear pattern, but the link was not perfect. The results show that staph bacteria are often present when eczema flares up, but they do not prove the bacteria cause the flare-ups.

It is important to know that this review does not show a direct cause-and-effect relationship. Having staph bacteria on the skin may be a result of the eczema, not the other way around. More research is needed to understand the exact connection.

Doctors should be aware that staph bacteria might play a role in eczema severity. However, they should not assume that killing the bacteria will cure the eczema. The review suggests that managing both the eczema and the bacteria could be helpful for patients.

Overall, this study adds to our understanding of eczema and staph bacteria. It highlights a connection that may help guide future treatments, but it does not change current medical advice. Patients should continue to follow their doctor's recommendations for eczema care.

What this means for you:
Staph bacteria on skin are linked to worse eczema, but they may not be the direct cause.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedMay 2026
View Original Abstract ↓
BackgroundA positive association between Staphylococcus aureus (S. aureus) colonization and atopic dermatitis (AD) severity has been reported. However, the strength and consistency of this relationship remain unclear.MethodsWe systematically searched PubMed, Embase, Cochrane Library, and Web of Science up to July 19, 2025. The reported correlation coefficients of studies have been extracted and converted into Fisher’s z-scores. The calculated values have been generated using a random-effects model in RevMan software and the final pooled result was converted to a correlation coefficient (r) with 95% confidence intervals. We tested the heterogeneity between the included studies using I². We also provide sensitivity analyzes and subgroup.ResultsSeven RCTs with 929 participants were included. The pooled analysis showed a moderate positive correlation between S. aureus colonization and AD severity (r = 0.42, 95%CI: 0.31–0.52). The observed heterogeneity was moderate but not significant (I² = 38%, P = 0.14). Sensitivity and subgroup analyzes supported the robustness of the main findings.ConclusionsS. aureus colonization is moderately associated with AD severity. However, it should not be interpreted as evidence of a direct causal relationship.Systematic Review Registrationhttps://www.crd.york.ac.uk/prospero/, identifier CRD420251104116.
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