Secondary Bacterial Infections and Nasal Colonization in Scabies and Atopic Dermatitis

September 4, 2026 updated by: Tunç Ozen, Istanbul Medeniyet University

Microbiological Profile of Secondary Bacterial Infections and Nasal Colonization in Patients With Scabies and Atopic Dermatitis: A Prospective Observational Study

This prospective observational study will evaluate the microbiological profile of secondary bacterial infection and nasal colonization in participants with scabies or atopic dermatitis. Bacteria isolated from impetiginized skin lesions and nasal swabs will be compared, and antimicrobial susceptibility patterns will be assessed. Healthy participants without an inflammatory skin disease or signs of infection will provide nasal swabs as a control group. Patients will be followed on days 7 and 14 to assess clinical response and related clinical measures.

Study Overview

Status

Not yet recruiting

Conditions

Detailed Description

Participants with dermatologist-confirmed scabies or atopic dermatitis and active impetiginized skin lesions will undergo clinical assessment and microbiological sampling. A superficial swab will be obtained from the infected skin lesion and a nasal swab will be obtained from the nasal vestibules. Healthy controls will undergo nasal sampling only. Cultures will be evaluated for Staphylococcus aureus, Streptococcus pyogenes, and other bacterial isolates. Antimicrobial susceptibility testing will be performed according to European Committee on Antimicrobial Susceptibility Testing (EUCAST) guidance. Skin and nasal isolates will be compared at the species level and by antimicrobial resistance profile. Clinical data include age, sex, disease duration, comorbidities, recent treatments, itch severity using a 0-10 visual analog scale, and lesion morphology, location, number, and excoriation. Patients will be contacted on days 7 and 14 to assess clinical response, new lesion development, change in itch severity, treatment adherence, and local or systemic adverse events.

Study Type

Observational

Enrollment (Estimated)

51

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

Participants presenting to a dermatology clinic will include patients with dermatologist-confirmed scabies or atopic dermatitis and active impetiginized skin lesions, as well as healthy controls without inflammatory skin disease or signs of infection.

Description

Inclusion Criteria:

  • Scabies group: dermatologist-confirmed scabies and an active impetiginized skin lesion.
  • Atopic dermatitis group: dermatologist-confirmed atopic dermatitis and an active impetiginized skin lesion.
  • Healthy control group: no inflammatory skin disease or clinical signs of infection.
  • Written informed consent (and appropriate parent/guardian permission when applicable).

Exclusion Criteria:

  • Systemic or topical antibiotic use within the previous 14 days.
  • Active nasal infection or nasal symptoms.
  • History of nasal surgery or anatomic nasal deformity.

TEST DRAFT NOTE: The source protocol contains wording that may conflict with inclusion of healthy controls; the final eligibility text must be reconciled with the ethics-approved protocol before release.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Scabies with impetiginized lesions
Participants with dermatologist-confirmed scabies and an active impetiginized skin lesion suggestive of secondary bacterial infection.
Atopic dermatitis with impetiginized lesions
Participants with dermatologist-confirmed atopic dermatitis and an active impetiginized skin lesion suggestive of secondary bacterial infection.
Healthy controls
Participants without an inflammatory skin disease or clinical signs of infection; nasal swab sampling only.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Concordance of bacterial species between impetiginized skin lesion and nasal cultures
Time Frame: At baseline (enrollment)
Among participants in the scabies and atopic dermatitis groups with paired evaluable skin and nasal cultures, concordance will be defined as isolation of the same bacterial species from both anatomical sites. Species-level agreement will be summarized and evaluated using Cohen's kappa coefficient.
At baseline (enrollment)

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Bacterial profile of impetiginized skin lesions
Time Frame: At baseline (enrollment)
The number and proportion of lesion cultures yielding Staphylococcus aureus, Streptococcus pyogenes, other bacteria, mixed growth, or no bacterial growth will be summarized.
At baseline (enrollment)
Nasal Staphylococcus aureus carriage across study groups
Time Frame: At baseline (enrollment)
The number and proportion of participants with nasal Staphylococcus aureus carriage will be summarized for the scabies, atopic dermatitis, and healthy control groups.
At baseline (enrollment)
Antimicrobial susceptibility and resistance profile of bacterial isolates
Time Frame: At baseline (enrollment)
Antimicrobial susceptibility results, including methicillin resistance among Staphylococcus aureus isolates and susceptibility to the antibiotics included in the laboratory panel, will be summarized for skin and nasal isolates.
At baseline (enrollment)
Clinical response at day 14
Time Frame: 14 days after enrollment
Clinical response will be categorized as complete remission, partial response, no change, or worsening. Associations with bacterial species, methicillin resistance, antimicrobial resistance, nasal carriage, and skin-nasal concordance will be explored.
14 days after enrollment
Change in itch severity from baseline to follow-up
Time Frame: Baseline, day 7, and day 14
Itch severity will be measured using a 0-10 visual analog scale. Change from baseline will be summarized at day 7 and day 14.
Baseline, day 7, and day 14
Development of new skin lesions during follow-up
Time Frame: Through 14 days after enrollment
The occurrence of new lesions during the 14-day follow-up period will be recorded.
Through 14 days after enrollment

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Istanbul Medeniyet University

Investigators

  • Principal Investigator: TEST INVESTIGATOR - REPLACE, TEST AFFILIATION - REPLACE

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

October 1, 2026

Primary Completion (Estimated)

March 1, 2027

Study Completion (Estimated)

March 1, 2027

Study Registration Dates

First Submitted

September 4, 2026

First Submitted That Met QC Criteria

September 4, 2026

First Posted (Actual)

September 10, 2026

Study Record Updates

Last Update Posted (Actual)

September 10, 2026

Last Update Submitted That Met QC Criteria

September 4, 2026

Last Verified

September 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • SCAB-AD-NASAL-TEST-001

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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