Daily News Analysis ‘Types of Fungal Infections (Mycoses)’ : 19 May

Why in News:

• The World Health Organization has classified fungal pathogens into priority tiers to guide global research and development toward critical public health threats.

Key Facts: Classification of Fungal Infections

• Superficial Mycoses: Infections strictly limited to the outermost layers of the skin, hair, and nails.
  • Mechanism: The fungi feed on keratin without penetrating deeper living tissue or triggering a systemic immune response.
  • Examples: Dermatophytosis (commonly known as Ringworm or Athlete’s Foot) and Pityriasis versicolor (a common condition causing discolored skin patches).
• Subcutaneous Mycoses: Infections that penetrate deep into the dermis, subcutaneous tissues, and adjacent bone structures.
  • Mechanism: These infections typically result from the direct traumatic entry of environmental fungi via thorns, splinters, or soil contamination on broken skin.
  • Examples: Sporotrichosis (often called Rose Gardener’s Disease) and Mycetoma (a chronic, progressive granulomatous infection that destroys tissue, heavily prevalent in tropical foot injuries).
• Systemic Mycoses: Deep-seated infections that invade internal organs and can disseminate throughout the entire body.
  • Mechanism: These are primarily initiated by inhaling airborne fungal spores from nature, which colonize the respiratory tract before traveling through the bloodstream.
  • Examples: Histoplasmosis (associated with bird or bat droppings) and Aspergillosis (a severe respiratory infection targeting the lungs).
• Opportunistic Mycoses: Infections caused by ubiquitous, everyday fungi that generally do not harm healthy individuals but turn aggressive in patients with weakened immune systems.
  • Mechanism: They exploit metabolic vulnerabilities, prolonged antibiotic use, or compromised immune barriers to rapidly multiply.
  • Examples: Candidiasis (Oral Thrush or yeast infections) and Mucormycosis (the aggressive “Black Fungus” infection that saw a major surge among immunocompromised individuals during the COVID-19 pandemic).