TABLE 4.

Efficiency of blood culture, serological testing, and PCR assays

Methoda	Value (%)b
	Sensitivity	Specificity	PPN	NPN
Blood culture	74	100	100	65.8
SAT ≥1:160	90.5	96.1	98	88.5
CT ≥1:320	65.5	98	99	59.2
CF ≥1:16	77.5	98	99	69
PCR A, bc	100	100	100	100
PCR A, wb	100	100	100	98
PCR A, se	97	100	100	94.3
PCR B, bc	100	100	100	100
PCR B, wb	98	100	100	96.1
PCR B, se	95.5	100	100	91.7
PCR C, bc	100	100	100	100
PCR C, wb	99	100	100	98
PCR C, se	97	100	100	94.3
PCR D, bc	100	100	100	100
PCR D, wb	98.5	100	100	97.1
PCR D, se	96.5	100	100	93.5

^aFor SAT, CT, and CF the titer result is indicated. bc, buffy coat; wb, whole blood; se, serum.

^bPPN, positive predictive number; NPN, negative predictive number.