Q.Ringworm is one of the most common infectious fungal disease in humans. Name any two genera of fungi which cause ringworm and state any of its two symptoms.

Concept: Dermatophytosis (ringworm) – a superficial fungal infection of keratinized tissues caused by dermatophyte fungi.

Ringworm is caused by a group of fungi called dermatophytes that digest keratin in skin, hair, and nails. The three main genera responsible are Microsporum, Trichophyton, and Epidermophyton.

Two causative genera:

1. Microsporum – commonly infects skin and hair
2. Trichophyton – infects skin, hair, and nails

Two characteristic symptoms: …

Ringworm, despite its misleading name, has nothing to do with worms. The term comes from the characteristic ring-shaped rash it produces. The infection is caused by a group of fungi called dermatophytes, which have a special ability: they can digest keratin, the protein that makes up our skin, hair, and nails. This is why ringworm infections are always superficial, confined to the outermost layers of the body.

The fungi thrive in warm, moist environments and spread easily through direct contact with infected individuals, animals, or contaminated objects like towels and combs. Understanding which genera cause the disease helps in diagnosis and treatment.

Causative Genera

The two most common fungal genera responsible for ringworm are:

1. Trichophyton

   This is the most frequent culprit worldwide. Species like Trichophyton rubrum and Trichophyton mentagrophytes infect skin, nails, and hair. They're responsible for athlete's foot, jock itch, and scalp ringworm.

2. Microsporum

   This genus primarily affects the scalp and skin. Microsporum canis, often transmitted from cats and dogs, is a common species. It causes the classic ring-shaped lesions on exposed skin.

Clinical Symptoms

Ringworm presents with distinctive features that make it recognizable:

1. Circular, scaly patches with raised borders

   The hallmark of ringworm is the ring-shaped lesion. The center often appears clearer or heals while the infection spreads outward, creating a red, raised, scaly border. This gives the appearance of a ring or circle on the skin.

2. Intense itching (pruritus) …