Table 1– Aetiology of 1095 patients with confirmed community-acquired pneumonia
PathogenConventional diagnostics#Conventional diagnostics + UAD
Definite+ pathogenProbable§ pathogenTotalƒDefinite+ pathogenProbable§ pathogenTotalƒ
Streptococcus pneumoniae24017257 (23.5)34710357 (32.6)
Haemophilus influenzae13738 (3.5)13435 (3.2)
Legionella pneumophila2525 (2.3)2525 (2.3)
Pseudomonas aeruginosa41115 (1.4)4711 (1.0)
Moraxella catarrhalis88 (0.7)77 (0.6)
Klebsiella spp.3912 (1.1)3811 (1.0)
Escherichia coli5611 (1.0)5611 (1.0)
Staphylococcus aureus347 (0.6)347 (0.6)
Other111930 (2.7)111829 (2.6)
Unknown692 (63.2)602 (55.0)
  • Data are presented as n or n (%). UAD: urinary antigen detection. #: causative pathogen based on the results of blood or other sterile fluid culture, immunochromatographic assay (ICA) urinary antigen test only and sputum culture; : causative pathogen based on results of blood or other sterile fluid culture, ICA urinary antigen test and UAD test results and sputum culture; +: pathogen cultured from blood or any other sterile body fluid or if the urinary antigen test was positive; §: pathogen identified in the absence of a definite pathogen and if it was present as dominant flora in the sputum culture; ƒ: n=1095.