Micro 66: Fungal and Fungal-Like Infections of Unusual or Uncertain Etiology

This episode concludes the mycology section by examining rare and atypical fungal or fungal-like pathogens. Drawing from Murray’s Chapter 66, it explores organisms that blur traditional classification or present unique diagnostic challenges.The chapter includes:* Pneumocystis jirovecii - once classified as a protozoan, now recognised as a fungus; a major cause of pneumonia in immunocompromised patients* Rare moulds and environmental organisms causing sporadic human disease* Fungal-like organisms whose taxonomy or pathogenic mechanisms differ from classic mycology patternsPneumocystis deserves particular attention. It causes interstitial pneumonia in immunocompromised hosts, especially individuals with advanced HIV infection. Unlike many fungi, it does not grow in routine culture, making molecular and histologic diagnosis essential.Conceptually, this chapter reminds us that classification evolves with scientific understanding. Clinically, rare organisms demand heightened suspicion in the appropriate host context.Key Takeaways* Some fungal pathogens are taxonomically unusual* Pneumocystis causes pneumonia in immunocompromised hosts* Routine culture may not detect certain fungi* Molecular and histologic methods are critical* Rare infections require strong clinical suspicion This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe