Human infections due to Malassezia spp

Area of Science:

• Mycology
• Infectious Diseases
• Medical Microbiology

Background:

• The genus Malassezia comprises lipophilic yeasts, including Malassezia furfur, Malassezia sympodialis, and Malassezia pachydermatis, typically inhabiting human and animal skin.
• While classically linked to superficial skin infections like pityriasis versicolor, these yeasts are increasingly recognized as agents of severe invasive human diseases.
• Malassezia catheter-associated sepsis is a significant concern, particularly in neonates receiving parenteral nutrition via central venous catheters.

Purpose of the Study:

• To review the characteristics of Malassezia yeasts and their role in superficial and invasive infections.
• To elucidate the pathogenesis and diagnosis of Malassezia catheter-associated sepsis in hospitalized patients, especially infants.
• To discuss current treatment strategies and identify areas for future research.

Main Methods:

• Literature review of Malassezia species, their epidemiology, and clinical manifestations.
• Analysis of diagnostic methods for both superficial and invasive Malassezia infections.
• Evaluation of treatment outcomes for Malassezia-related sepsis.

Main Results:

• Malassezia furfur colonization is common in neonatal intensive care unit infants, potentially leading to catheter-related sepsis.
• Catheter colonization may occur asymptomatically and is likely secondary to skin colonization.
• Diagnosis of sepsis relies on detecting the yeast in blood or catheter samples; treatment often involves catheter removal, with antifungals not always necessary.

Conclusions:

• Malassezia yeasts pose a risk for invasive infections, particularly sepsis in vulnerable patient populations.
• Effective management of Malassezia catheter-associated sepsis hinges on prompt diagnosis and catheter removal.
• Further research into Malassezia virulence factors and host immune responses is needed for a comprehensive understanding of pathogenesis.