Persistence of Streptococcus pneumoniae urinary antigen excretion after pneumococcal pneumonia

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Respiratory Medicine

Background:

• Pneumococcal pneumonia, caused by Streptococcus pneumoniae, is a significant global health concern.
• Accurate diagnosis and monitoring of pneumococcal pneumonia are crucial for effective patient management.
• Urinary antigen detection is a common diagnostic tool, but its excretion duration is not well-defined.

Purpose of the Study:

• To determine the duration of Streptococcus pneumoniae antigen excretion in urine following pneumococcal pneumonia.
• To assess factors influencing the persistence of urinary antigen detection.
• To inform the interpretation of positive urinary antigen test results in pneumonia patients.

Main Methods:

• Prospective study involving patients diagnosed with pneumococcal pneumonia.
• Collection and analysis of urine samples at various time points post-diagnosis.
• Detection of Streptococcus pneumoniae antigen using urinary antigen tests (non-concentrated and concentrated urine).

Main Results:

• Urinary antigen detection persisted in 52.9% of patients at one month post-pneumonia.
• Positive results were observed up to 6 months in non-concentrated urine.
• In concentrated urine, antigen was detected in all patients for at least 3 months, with some positive for over a year.
• No correlation found between patient factors (age, gender, etc.) and antigen excretion duration.

Conclusions:

• Streptococcus pneumoniae urinary antigen excretion can be prolonged, extending beyond several months post-pneumonia.
• The duration of antigenuria is significantly longer when using concentrated urine samples.
• Understanding antigen excretion kinetics is vital for accurate interpretation of urinary antigen tests in pneumonia diagnosis and management.