## Anthropophilic Dermatophytes **Key Point:** Trichophyton rubrum is the most common anthropophilic dermatophyte worldwide and in India, responsible for the majority of tinea corporis cases. ### Classification of Dermatophytes by Host Preference | Category | Definition | Examples | | --- | --- | --- | | **Anthropophilic** | Infect humans; human-to-human transmission | T. rubrum, T. mentagrophytes var. mentagrophytes, E. floccosum | | **Zoophilic** | Infect animals; animal-to-human transmission | M. canis, T. mentagrophytes var. quinckeanum | | **Geophilic** | Found in soil; soil-to-human transmission | T. mentagrophytes var. quinckeanum, M. gypseum | ### Why T. rubrum Dominates 1. **Epidemiological prevalence:** Accounts for 60–80% of dermatophyte infections in temperate and tropical regions 2. **Transmission:** Spreads easily through direct contact and fomites in human populations 3. **Clinical spectrum:** Causes tinea corporis, pedis, unguium, and cruris with equal frequency 4. **Chronicity:** Often causes chronic, indolent infections due to host immune tolerance **High-Yield:** In India, T. rubrum is the leading cause of dermatophytosis across all age groups and body sites. Recognition of this epidemiology is essential for empiric antifungal therapy decisions. **Clinical Pearl:** Zoophilic dermatophytes (e.g., M. canis from pet contact) typically cause acute, inflammatory lesions and self-limit when the animal source is removed.
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