Diagnosis of pneumococcal pneumonia: current pitfalls and the way forward

Joon Young Song, Byung Wook Eun, Moon H Nahm, Joon Young Song, Byung Wook Eun, Moon H Nahm

Abstract

Streptococcus pneumoniae is the most common cause of community-acquired pneumonia. However, it can also asymptomatically colonize the upper respiratory tract. Because of the need to distinguish between S. pneumoniae that is simply colonizing the upper respiratory tract and S. pneumoniae that is causing pneumonia, accurate diagnosis of pneumococcal pneumonia is a challenging issue that still needs to be solved. Sputum Gram stains and culture are the first diagnostic step for identifying pneumococcal pneumonia and provide information on antibiotic susceptibility. However, these conventional methods are relatively slow and insensitive and show limited specificity. In the past decade, new diagnostic tools have been developed, particularly antigen (teichoic acid and capsular polysaccharides) and nucleic acid (ply, lytA, and Spn9802) detection assays. Use of the pneumococcal antigen detection methods along with biomarkers (C-reactive protein and procalcitonin) may enhance the specificity of diagnosis for pneumococcal pneumonia. This article provides an overview of current methods of diagnosing pneumococcal pneumonia and discusses new and future test methods that may provide the way forward for improving its diagnosis.

Keywords: Diagnosis; Pneumococcal pneumonia; Polymerase chain reaction; Streptococcus pneumoniae.

Figures

Figure 1
Figure 1
S. pneumoniae isolates expressing most capsule types make small round colonies similar to doughnuts on blood agar plate (A) but serotype 3 and 37 pneumococci develop characteristically large mucoid colonies (B).
Figure 2
Figure 2
S. pneumoniae growth is inhibited around the paper disk containing optochin (A). The test tube containing S. pneumoniae shows a loss of turbidity in the presence of sodium deoxycholate (bile salts) due to bacterial lysis while the test tube containing viridans species is turbid (B).

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