Table 2.
Results of microbiological tests (n = 164) in all patients with Legionella CAP (n = 82).
| Established by \Etiologic Diagnosis |
L. pn 1a (n = 57) |
L. pnb & 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 | |
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.
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).