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Pleural infection is associated with 20% mortality in the 80 000 new cases per year in the UK and USA. Streptococcus species cause ∼50% of community-acquired bacterial pleural infection.1 Staphylococcus aureus and anaerobes are isolated in 8% and 20% of cases, respectively, and 12% of pleural infections yield polymicrobial cultures. However, even using culture and nucleic acid amplification techniques (NAATs), 26% of cases remain microbiologically obscure.
The negative microbiology may be due to previous antibiotic treatment, varying pathogen prevalence in different pleural fluid locules (already known to vary biochemically2) or the presence of organisms that are difficult to detect using conventional techniques. One such possible organism is Pneumocystis jirovecii, which requires specialist diagnostic techniques (eg, Grocott–Gomori methenamine silver staining or NAATs).
P jirovecii has been identified in sputum and bronchoalveolar lavage (BAL) fluid from both immunocompromised and immunocompetent individuals—it has been isolated from BAL fluid using NAATs …