Invasive pulmonary aspergillosis: current diagnostic methodologies and a new molecular approach

Area of Science:

• Medical Mycology
• Infectious Diseases
• Molecular Diagnostics

Background:

• Invasive pulmonary aspergillosis (IPA) is a severe fungal infection caused by Aspergillus fumigatus, particularly affecting immunocompromised individuals.
• IPA has high mortality rates, often linked to late and non-specific diagnoses.
• Current diagnostic methods frequently identify only the Aspergillus genus, not the specific species.

Purpose of the Study:

• To highlight the limitations of current diagnostic methods for IPA.
• To emphasize the need for species-specific detection of Aspergillus fumigatus.
• To propose fluorescent in situ hybridization (FISH) as a promising diagnostic tool.

Main Methods:

• Review of existing diagnostic techniques for invasive pulmonary aspergillosis.
• Analysis of conventional mycological examinations (microscopy, histology, culture).
• Evaluation of non-culture-based tests (galactomannan, β(1,3)-glucan) and PCR-based molecular tests.
• Exploration of fluorescent in situ hybridization (FISH) as a molecular diagnostic method.

Main Results:

• Most current diagnostic methods for IPA lack species-level specificity, identifying only the Aspergillus genus.
• Conventional and some molecular methods do not reliably differentiate Aspergillus fumigatus from other Aspergillus species.
• FISH presents a potential for accurate, species-level identification of Aspergillus fumigatus.

Conclusions:

• There is a critical need for improved diagnostic methods for invasive pulmonary aspergillosis that can identify Aspergillus fumigatus at the species level.
• Fluorescent in situ hybridization (FISH) is a promising molecular technique that could significantly enhance the specific detection of Aspergillus fumigatus.
• Implementing FISH could lead to earlier and more accurate diagnoses, potentially improving patient outcomes for IPA.