Table 4. IRIDICA-positive and blood culture-negative detections.

PCR/ESI-MS-reported organism with blood culture negative result	No. of PCR/ESI-MS-positive, blood culture-negative samples	Medical records review
Escherichia coli	5	Urine culture positive for Escherichia coli/Effective antibiotic treatment against Escherichia coli
Klebsiella pneumoniae	3	Urine culture positive for Klebsiella pneumoniae/Clinical diagnosis of pneumoniae/Klebsiella pneumoniae identified in aortic abscess
Pseudomonas aeruginosa	2	Clinical diagnosis: sepsis from urinary tract infection
Legionella pneumophila	2	Detection of Legionella pneumophila urinary antigen
Bartonella henselae	1	Positive serology for Bartonella henselae
Neisseria gonorrhoeae	1	Clinical diagnosis: pelviperitonitis Neisseria gonorrhoeae-related
Neisseria meningitidis	1	Clinical data insufficient
Streptococcus agalactiae	1	Clinical presentation compatible with Streptococcus agalactiae infection

In 16 patients a potential pathogen was detected by the molecular method but not by MALDI-TOF. The review of clinical data and additional relevant exams from other specimens was used for the resolution of discrepancies.