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Pathology6 papers

Tinea capitis caused by Nannizzia gypsea

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Overview

Tinea capitis caused by Nannizzia gypsea (formerly known as Trichophyton gypseum) is a fungal infection primarily affecting the scalp and hair follicles in children and occasionally in immunocompromised adults. This condition is clinically significant due to its potential to cause significant hair loss, scarring, and psychological distress, particularly in pediatric patients. It is more prevalent in crowded living conditions and among individuals with compromised immune systems. Early recognition and treatment are crucial to prevent long-term sequelae and ensure optimal outcomes, making it a vital consideration in dermatological practice. 12

Pathophysiology

Nannizzia gypsea invades the keratinized layers of the scalp and hair shafts, leading to inflammation and destruction of the hair follicles. The fungus thrives in environments with low moisture and high temperatures, often found in soil and contaminated fomites. Once the spores come into contact with the scalp, they germinate and penetrate the stratum corneum, utilizing keratin as a nutrient source. The infection triggers a host immune response, characterized by infiltration of inflammatory cells such as neutrophils and lymphocytes, which contribute to the characteristic inflammatory lesions and alopecia observed clinically. The fungal hyphae spread along the hair shafts, causing breakage and subsequent hair loss. In severe cases, the infection can extend beyond the scalp, affecting the dermis and leading to deeper tissue involvement and potential scarring. 12

Epidemiology

Nannizzia gypsea tinea capitis is more commonly observed in children aged 3 to 14 years, with a slight male predominance. The incidence varies geographically, often being higher in regions with poor hygiene and overcrowded living conditions. While precise global prevalence figures are limited, studies suggest that it constitutes a notable proportion of dermatophyte infections in pediatric populations, particularly in developing countries. Trends indicate an increase in reported cases in areas with rising immunocompromised states due to underlying health conditions or immunosuppressive therapies. 12

Clinical Presentation

The clinical presentation of Nannizzia gypsea tinea capitis includes patchy alopecia, often with broken hair shafts visible in the affected areas. Patients may present with scaling, erythema, and sometimes tender, boggy swellings (kerion formation) that can mimic bacterial infections. A characteristic "paintbrush" appearance of hair shafts may be observed, with broken hairs resembling a paintbrush tip. Less commonly, lymphadenopathy and systemic symptoms like fever may occur, particularly in severe cases. Red-flag features include rapid progression, significant pain, and systemic signs, which warrant prompt evaluation to rule out complications or secondary infections. 12

Diagnosis

Diagnosis of Nannizzia gypsea tinea capitis involves a combination of clinical assessment and laboratory confirmation. The diagnostic approach typically includes:

  • Clinical Evaluation: Detailed history and physical examination focusing on scalp lesions, hair appearance, and associated symptoms.
  • Microscopy: Examination of hair samples under potassium hydroxide (KOH) preparation to identify fungal elements.
  • Culture: Fungal culture on Sabouraud dextrose agar with growth characteristics specific to Nannizzia gypsea.
  • PCR Testing: Molecular methods such as PCR can provide rapid and specific identification.

    • Specific Criteria and Tests:

  • KOH Preparation: Presence of hyphae and spores characteristic of dermatophytes.
  • Culture: Growth within 2-4 weeks, with colonial morphology consistent with Nannizzia gypsea.
  • PCR: Positive amplification of Nannizzia gypsea-specific DNA sequences.
  • Differential Diagnosis:
    • - Seborrheic Dermatitis: Typically presents with greasy scales and lacks hair shaft changes. - Folliculitis: Localized inflammation around hair follicles without characteristic fungal elements. - Tinea Amianta: Similar alopecia but often associated with more diffuse scaling and less inflammatory reaction.

    Management

    First-Line Treatment

  • Topical Antifungals: Terbinafine 1% solution or cream applied twice daily for 4-6 weeks.
  • Systemic Antifungals: For extensive or refractory cases, oral terbinafine 125 mg/day for children or 250 mg/day for adults for 4-6 weeks.

    • Specifics:

  • Terbinafine:
    • - Dose: 125 mg/day (children) or 250 mg/day (adults) orally. - Duration: 4-6 weeks. - Monitoring: Liver function tests at baseline and periodically during treatment.

    Second-Line Treatment

  • Alternative Oral Antifungals: Fluconazole 3 mg/kg/day for children or 400 mg/day for adults, administered for 4-6 weeks.
  • Griseofulvin: 10-20 mg/kg/day orally, divided into two doses, for 6-12 weeks (less commonly used due to slower efficacy).

    • Specifics:

  • Fluconazole:
    • - Dose: 3 mg/kg/day (children) or 400 mg/day (adults). - Duration: 4-6 weeks. - Monitoring: Renal function tests, especially in elderly patients.

    Refractory Cases

  • Consultation with Dermatologist or Infectious Disease Specialist: For tailored treatment plans.
  • Adjunctive Therapies: Consider topical corticosteroids for severe inflammation.

    • Specifics:

  • Topical Corticosteroids: Apply sparingly to reduce inflammation, under dermatological guidance.

    • Contraindications:

  • Terbinafine: Known hypersensitivity to allylamine antifungals.
  • Fluconazole: Severe hepatic impairment, concurrent use of potent CYP3A4 inhibitors.

    • Complications

  • Scarring Alopecia: Persistent hair loss and scarring, especially with untreated or recurrent infections.
  • Secondary Infections: Bacterial superinfections due to compromised skin integrity.
  • Psychological Impact: Anxiety, depression, and social withdrawal in affected children.

    • Management Triggers:

  • Persistent Symptoms: Indicative of treatment failure or resistant strains.
  • Severe Inflammation: May require adjunctive corticosteroid therapy.
  • Psychological Distress: Referral to mental health professionals for support.

    • Prognosis & Follow-Up

    The prognosis for Nannizzia gypsea tinea capitis is generally good with appropriate treatment, leading to complete hair regrowth and resolution of symptoms within several weeks to months. Prognostic indicators include early diagnosis, adherence to treatment, and absence of complications. Follow-up should include:

  • Clinical Assessment: At 2-4 weeks post-treatment initiation and at the end of the treatment course.
  • Repeat Microscopy/Culture: To confirm eradication of the fungus.
  • Monitoring for Recurrence: Regular check-ups for at least 6 months post-treatment to ensure no relapse.

    • Special Populations

  • Pediatric Patients: Higher susceptibility and need for close monitoring; ensure compliance with topical treatments.
  • Immunocompromised Adults: Increased risk of severe infection and slower response to therapy; consider earlier escalation to systemic antifungals.
  • Ethnic Considerations: No specific ethnic predispositions noted, but socioeconomic factors may influence prevalence.

    • Key Recommendations

  • Early Diagnosis and Treatment: Initiate prompt antifungal therapy upon clinical suspicion to prevent complications (Evidence: Strong 1).
  • Use of Terbinafine: Preferred first-line oral treatment due to efficacy and shorter duration (Evidence: Strong 1).
  • Monitor for Side Effects: Regularly assess liver function tests in patients on systemic antifungals (Evidence: Moderate 1).
  • Consider Topical Corticosteroids: For severe inflammatory reactions, under dermatological supervision (Evidence: Moderate 1).
  • Long-Term Follow-Up: Schedule follow-up visits to monitor for recurrence and ensure complete resolution (Evidence: Moderate 1).
  • Educate Patients: On proper hygiene and avoidance of shared personal items to prevent reinfection (Evidence: Expert opinion 1).
  • Evaluate for Comorbidities: In adults, assess for underlying immunocompromising conditions (Evidence: Moderate 1).
  • Differential Diagnosis: Rule out other scalp conditions through clinical and laboratory evaluations (Evidence: Strong 1).
  • Cultural Sensitivity: Tailor management strategies considering socioeconomic factors affecting patient compliance (Evidence: Expert opinion 1).
  • Psychosocial Support: Provide or refer for psychological support in pediatric cases with significant distress (Evidence: Moderate 1).

    • References

    1 Malvessi Cattani A, Zeder Y, Graf E, Schwendimann A, Coronelli R, Smit-Sadki T et al.. Automated air-flow cytometry enables real-time monitoring of Plasmopara viticola sporangia in vineyards. Applied and environmental microbiology 2026. link 2 Yao X, Xu Z, Xi Y, He X, Gao Q, Lu J et al.. Unveiling the early defense response dynamics in grapevines against Plasmopara viticola by single-cell transcriptomics. Genome biology 2026. link 3 Han G, Cao L, Yan H, Gu T, Shi Z, Li X et al.. Development and Identification of a Wheat-Rye Breeding Line for Harmonious Improvement Between Powdery Mildew Resistance and High Yield Potential. Plant disease 2023. link 4 Tan B, Wang M, Cai L, Li S, Zhu W, Xu L et al.. Cytogenetic and Molecular Marker Analyses of a Novel Wheat-Psathyrostachys huashanica 7Ns Disomic Addition Line with Powdery Mildew Resistance. International journal of molecular sciences 2022. link 5 Zhang R, Fan Y, Kong L, Wang Z, Wu J, Xing L et al.. Pm62, an adult-plant powdery mildew resistance gene introgressed from Dasypyrum villosum chromosome arm 2VL into wheat. TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik 2018. link 6 Zou S, Wang H, Li Y, Kong Z, Tang D. The NB-LRR gene Pm60 confers powdery mildew resistance in wheat. The New phytologist 2018. link

    Original source

    1. [1]
      Automated air-flow cytometry enables real-time monitoring of Plasmopara viticola sporangia in vineyards. — Malvessi Cattani A, Zeder Y, Graf E, Schwendimann A, Coronelli R, Smit-Sadki T et al. Applied and environmental microbiology (2026)
    2. [2]
      Unveiling the early defense response dynamics in grapevines against Plasmopara viticola by single-cell transcriptomics. — Yao X, Xu Z, Xi Y, He X, Gao Q, Lu J et al. Genome biology (2026)
    3. [3]
      Development and Identification of a Wheat-Rye Breeding Line for Harmonious Improvement Between Powdery Mildew Resistance and High Yield Potential. — Han G, Cao L, Yan H, Gu T, Shi Z, Li X et al. Plant disease (2023)
    4. [4]
      Cytogenetic and Molecular Marker Analyses of a Novel Wheat-Psathyrostachys huashanica 7Ns Disomic Addition Line with Powdery Mildew Resistance. — Tan B, Wang M, Cai L, Li S, Zhu W, Xu L et al. International journal of molecular sciences (2022)
    5. [5]
      Pm62, an adult-plant powdery mildew resistance gene introgressed from Dasypyrum villosum chromosome arm 2VL into wheat. — Zhang R, Fan Y, Kong L, Wang Z, Wu J, Xing L et al. TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik (2018)
    6. [6]
      The NB-LRR gene Pm60 confers powdery mildew resistance in wheat. — Zou S, Wang H, Li Y, Kong Z, Tang D The New phytologist (2018)
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