Pneumocystis jirovecii multilocus genotyping profiles in Northern Ireland

Area of Science:

• Medical Mycology
• Infectious Diseases
• Epidemiology

Background:

• Pneumocystis jirovecii pneumonia (PCP) is a severe opportunistic infection primarily affecting immunosuppressed patients.
• Transmission occurs through airborne routes and environmental exposure.
• Rising PCP incidence in Northern Ireland necessitated a comprehensive review.

Purpose of the Study:

• To conduct an epidemiological and molecular review of P. jirovecii infections.
• To investigate the diversity of P. jirovecii strains in an immunosuppressed cohort.
• To identify potential common sources of infection, particularly in renal transplant recipients.

Main Methods:

• Enhanced surveillance of all lower respiratory specimens for P. jirovecii.
• Molecular genotyping of P. jirovecii positive specimens using multiple locus sequence typing (MLST).
• Analysis of circulating strains across different patient risk categories.

Main Results:

• Multiple P. jirovecii MLST types were identified across various patient risk groups.
• A predominant MLST type was observed during an outbreak specifically among renal transplant patients.
• The study demonstrated significant strain diversity within the local immunosuppressed population.

Conclusions:

• Genotyping is crucial for investigating common sources of P. jirovecii in immunosuppressed patients.
• The findings highlight the importance of molecular epidemiology in understanding PCP outbreaks.
• Strain diversity influences transmission dynamics and outbreak patterns in vulnerable populations.