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Table 2 Results of microbiological tests (n = 164) in all patients with Legionella CAP (n = 82).

From: Clinical predictors for Legionella in patients presenting with community-acquired pneumonia to the emergency department

Established by \Etiologic Diagnosis L. pn1a
(n = 57)
L. pn b& L.
spp.c
(n = 13)
L. spp
(n = 12)
Urinary antigen testing (n = 72) Positive (n = 59) 50 9 0
  Negative (n = 13) 1 4 8
Respiratory specimen
culture (n = 54)
Positive (n = 23) 14 8 1
  Negative (n = 31) 19 5 7
Respiratory specimen
PCRd (n = 38)
Positive (n = 34) 10 13 11
  Negative (n = 4) 4 0 0
  1. a L. pn 1, b L. pn and c L. spp. denote Legionella pneumophila serogroup 1, Legionella pneumophila and Legionella species; d PCR denotes polymerase chain-reaction, respectively.
  2. The goldstandard for diagnosis of Legionella CAP was the clinical diagnosis of a community-acquired pneumonia with an infiltrate on chest X-ray and at least one positive microbiological test for Legionella (urinary antigen testing, culture results from respiratory specimen or PCR from respiratory specimen).