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

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

Established by \Etiologic Diagnosis		L. pn1^a (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 PCR^d (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).

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