Aspergillus DNA contamination in blood collection tubes

Area of Science:

• Mycology
• Molecular Diagnostics
• Clinical Microbiology

Background:

• Polymerase chain reaction (PCR)-based diagnostic methods are crucial for identifying fungal infections.
• Contamination of samples or reagents can lead to false-positive results in PCR assays.
• Fungal DNA contamination poses a significant challenge to the accuracy of molecular diagnostics.

Purpose of the Study:

• To investigate the prevalence of fungal DNA contamination in sample collection containers.
• To assess the risk of contamination in diagnostic workflows.
• To identify specific fungal species contributing to contamination.

Main Methods:

• Real-time PCR assays were employed to detect fungal DNA.
• Various types of sample collection containers were tested.
• Samples were analyzed for the presence of fungal genetic material.

Main Results:

• Up to 18% of blood collection tubes showed detectable fungal DNA contamination.
• The predominant fungal species identified was likely Aspergillus fumigatus.
• Lower, but present, contamination rates were observed in other types of collection vessels.

Conclusions:

• Sample collection containers, particularly blood tubes, can be a source of fungal DNA contamination.
• This contamination poses a risk to the reliability of fungal PCR diagnostic tests.
• Quality control measures for collection materials are essential to ensure accurate diagnostic outcomes.