TABLE 3.

Number of cases and control samples positive for anti-Bbp IgG, indicating S. aureus infection^a

Patient group	No. of cases		No. of controls
	Total	Positive	Total	Positive
Total osteomyelitis	75	49	34b	12
Vertebral osteitis	18	15	6	2
Diabetic foot infection	17	13	2	0
Presence of foreign body	21	9	17	6
Other osteomyelitis	19	12	6	4
Septic arthritis	17	7	29c	10
Endocarditis	21	4	23d	7
Septicemia	18	1	12	1
Soft tissue infection	24	1	3	0
Respiratory tract infection	NA		9	0
Healthy blood donor	NA		29	1
Total	155	110	139	53

^aControl samples were from individuals with other defined infections or healthy blood donors. Patients with titers above the cutoff for anti-Bbp IgG are indicated as positive. NA, not applicable.

^bCoagulase-negative staphylococci were found in positive samples among control patients in 8/17 patients of the osteomyelitis group.

^cCoagulase negative-staphylococci were found in positive samples among control patients in 4/10 patients of the septic arthritis group.

^dCoagulase-negative staphylococci were found in positive samples among control patients in 2/3 patients of the endocarditis group.