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Wilder’s Disease (Disseminated Cutaneous Larva Migrans)

Overview

Wilder’s disease is a colloquial name for disseminated cutaneous larva migrans (CLM), a skin infestation caused by the larvae of animal hookworms—most commonly Ancylostoma braziliense and Ancylostoma caninum. The condition is characterized by intensely itchy, serpiginous (snake‑like) tracks that migrate across the skin as the larvae move.

Although the classic form involves a single, winding tract, the **disseminated** variant presents with many overlapping tracks and can affect larger body areas, especially in people with prolonged exposure.

• Who it affects: Travelers to tropical/subtropical regions, beach‑goers, agricultural workers, and residents of areas with poor sanitation. Children are especially prone because they frequently play barefoot in contaminated soil or sand.
• Prevalence: Exact global numbers are unknown, but the CDC estimates >1 million cases of CLM occur each year in endemic regions of the Caribbean, Central and South America, sub‑Saharan Africa, and Southeast Asia. Disseminated disease accounts for ~5–10 % of documented CLM cases.<sup>[1] CDC, 2023</sup>

Symptoms

The clinical picture varies with the number of larvae and the area of skin involved. Common signs and symptoms include:

Cutaneous findings

• Serpiginous tracks: Raised, erythematous, pink‑red lines 1–5 mm wide that advance 2–5 mm per day.
• Multiple tracks: In disseminated disease, dozens to hundreds of parallel or intersecting tracts may appear.
• Vesicles or pustules: Small blisters can form at the leading edge of the track.
• Erythema and edema: Surrounding skin may become inflamed and swollen.

Systemic & subjective symptoms

• Intense pruritus: Often described as “burning” and may worsen at night.
• Secondary bacterial infection: Scratching can cause impetigo, cellulitis, or abscess formation.
• Fever, malaise, lymphadenopathy: Rare, but may occur if infection spreads.
• Sleep disturbance: Itching can interfere with rest, especially in children.

Causes and Risk Factors

CLM is a zoonotic infection. The life cycle begins when adult hookworms live in the intestines of dogs or cats and lay eggs in their feces. In warm, moist environments, the eggs hatch into rhabditiform larvae, which mature into infectious filariform larvae within 5–7 days.

Transmission

• Direct skin contact with contaminated soil, sand, or mud.
• Walking barefoot or wearing open footwear on beaches, playgrounds, farms, or in communal areas where animal feces are present.
• Contact with damp clothing or towels that have been exposed to larvae.

Risk factors

• Travel to or residence in endemic tropical/subtropical regions.
• Occupations involving soil or sand (farmers, construction workers, beach resort staff).
• Pet ownership without regular deworming of dogs/cats.
• Living in areas with inadequate sewage disposal.
• Children who play barefoot in playgrounds or sandboxes.
• Immunocompromised conditions (e.g., HIV, chronic steroids) – increase likelihood of disseminated disease.

Diagnosis

Diagnosis is primarily clinical, based on characteristic skin findings and exposure history. Laboratory tests are rarely needed, but may be used to rule out other conditions.

Clinical evaluation

• Detailed travel and exposure questionnaire.
• Physical exam focusing on the pattern, length, and movement of the tracks.

When additional tests are considered

• Skin biopsy: Rarely performed; would show larval cross‑sections within the epidermis.
• Dermatopathology: Helpful if the presentation is atypical or mimics cellulitis, scabies, or fungal infection.
• Complete blood count (CBC): May reveal eosinophilia in systemic or disseminated cases.
• Culture of secondary infection: If bacterial superinfection is suspected.

Treatment Options

Effective therapy is available, and most cases resolve within 1–2 weeks once treatment starts.

Anthelmintic medications (first‑line)

Drug	Typical dose	Duration	Notes
Ivermectin	200 µg/kg orally once daily	1–2 doses (repeat after 24 h if needed)	Highly effective; safe in adults & children >15 kg.
Albendazole	400 mg orally twice daily	3 days (may extend to 5 days for disseminated disease)	Alternative when ivermectin unavailable.
Thiabendazole	500 mg orally three times daily	5 days	Less commonly used due to gastrointestinal side effects.

Adjunctive measures

• Antihistamines (e.g., cetirizine 10 mg daily) to control itching.
• Topical corticosteroids (hydrocortisone 1 % cream) for localized inflammation.
• Antibiotics (e.g., cephalexin) if secondary bacterial infection is present.

Procedural options

Rarely needed, but in stubborn cases, cryotherapy or surgical excision of persistent tracks has been reported.

Lifestyle & supportive care

• Cool compresses to soothe itching.
• Maintain short, clean nails to limit skin trauma.
• Avoid scratching to reduce infection risk.

Living with Wilder’s Disease (Disseminated Cutaneous Larva Migrans)

Although treatment is short, the itching can be disruptive. Below are practical tips for daily management during the acute phase.

Skin care

• Take lukewarm baths with colloidal oatmeal or baking soda to calm pruritus.
• Apply a fragrance‑free moisturizer after baths to preserve skin barrier.
• Use thin cotton clothing to reduce friction on lesions.

Itch control

• Schedule antihistamines at bedtime to improve sleep.
• Consider non‑sedating options (e.g., loratadine) during the day.
• Apply over‑the‑counter pruritus relievers (e.g., 1 % pramoxine cream) as needed.

Prevent secondary infection

• Keep lesions clean with mild soap and water twice daily.
• Cover large, open areas with sterile gauze if they are likely to be scratched.
• Watch for redness, warmth, or pus—promptly seek care if these appear.

Psychosocial aspects

• Explain the condition to family members, especially children, to reduce anxiety.
• Encourage short, frequent breaks from school or work if itching interferes with concentration.

Prevention

Because CLM is acquired through skin contact with contaminated environments, prevention focuses on barrier protection and hygiene.

• Wear protective footwear: Sandals or flip‑flops are inadequate on beaches; use waterproof shoes or boots when walking on sand, soil, or wet grass.
• Limit barefoot play: Encourage children to wear shoes in playgrounds, sandboxes, and farms.
• Maintain pet health: Deworm dogs and cats every 3–6 months per veterinary guidance; promptly clean up pet feces.
• Environmental sanitation: Use proper waste disposal, especially in rural communities; public health campaigns to keep beaches clean.
• Dry clothing: Avoid wearing damp swimwear or towels for extended periods; change into dry clothes promptly.
• Use barrier creams: Zinc‑oxide or petroleum‑jelly can provide a temporary skin barrier when footwear is not possible.

Complications

While CLM is usually self‑limited, untreated or severe disseminated disease can lead to:

• Secondary bacterial infection: Impetigo, cellulitis, or abscesses requiring antibiotics.
• Hyperinfection syndrome: Extremely rare; larvae penetrate deeper tissues, potentially affecting the lungs or gastrointestinal tract in immunocompromised hosts.
• Chronic pruritus: Persistent itching may cause skin thickening (lichenification) or psychosocial distress.
• Scarring: Prolonged inflammation can leave hyperpigmented or atrophic scars at healed sites.

When to Seek Emergency Care

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References

1. Centers for Disease Control and Prevention (CDC). “Hookworm Infection (Cutaneous Larva Migrans).” Updated 2023.
2. Mayo Clinic. “Cutaneous larva migrans.” Patient Care & Health Information, 2022.
3. World Health Organization (WHO). “Soil‑transmitted helminth infections.” Fact sheet, 2021.
4. Cleveland Clinic. “Cutaneous Larva Migrans (CLM) – Diagnosis & Treatment.” 2023.
5. Hotez PJ, et al. “Neglected tropical diseases in the United States.” New England Journal of Medicine. 2020;382:268‑277.

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