TABLE 2.

Summary of log reduction in viable spores as a function of exposure to 500 ppmv of CD gas

CT (ppmv-h)	Log reduction (avg ± SD) in no. of viable spores by material typea
	Carpet		Ceiling tile		Cinder block		I-beam steel		Wallboard		Wood
	CSI	Sabre	CSI	Sabre	CSI	Sabre	CSI	Sabre	CSI	Sabre	CSI	Sabre
250	3.3 ± 1.1	2.7 ± 0.5	2.7 ± 0.5	2.5 ± 0.5	2.0 ± 0.7	1.5 ± 1.0	2.4 ± 1.1	2.4 ± 0.5	2.1 ± 0.9	1.2 ± 0.5	1.4 ± 0.4	1.0 ± 0.3
500	4.3 ± 1.5	3.5 ± 0.9	5.7 ± 1.1	4.5 ± 1.0	2.4 ± 1.3	1.9 ± 0.8	4.6 ± 1.6	3.0 ± 0.6	4.7 ± 2.3	2.3 ± 0.6	2.2 ± 0.7	1.6 ± 0.6
1,500	6.9 ± 0.2	5.5 ± 1.2	6.9 ± 0.4	6.8 ± 0.5	4.1 ± 2.2	4.2 ± 2.2	5.9 ± 1.3	4.9 ± 1.8	6.1 ± 1.5	5.6 ± 1.4	3.1 ± 0.7	3.4 ± 1.2
2,500	6.9 ± 0.2	6.6 ± 0.2	7.2 ± 0.1	6.8 ± 0.4	4.4 ± 2.1	4.1 ± 1.3	5.9 ± 1.1	5.3 ± 1.1	6.4 ± 1.4	5.6 ± 1.4	4.3 ± 1.2	3.3 ± 0.7
5,000	6.9 ± 0.2	6.6 ± 0.2	7.2 ± 0.1	7.0 ± 0.1	4.2 ± 1.7	5.3 ± 1.5	6.7 ± 0.7	6.4 ± 0.8	7.2 ± 0.2	6.9 ± 0.2	6.3 ± 1.1	4.8 ± 1.6
PCb	6.9 ± 0.2	6.6 ± 0.2	7.2 ± 0.1	7.0 ± 0.1	7.1 ± 0.2	6.9 ± 0.2	7.1 ± 0.2	7.0 ± 0.1	7.2 ± 0.1	6.9 ± 0.2	7.1 ± 0.2	7.0 ± 0.1

^aInoculated coupons were exposed to either CSI or Sabre CD gas at 500 ppmv for a period of 0.5, 1, 3, 5 or 10 h, and viable spores were extracted from building materials as detailed in the Materials and Methods section. Values highlighted in boldface indicate complete kill, based on pour-plating data of the one-third fraction (detection limit of approximately 5 to 10 viable spores per sample).

^bPC, positive control. Values represent the average (with SD) of the log number of recovered spores from all positive controls of each material type. This value is used to calculate the log reduction, by subtracting the average log number of viable spores recovered from the replicate coupons of each material type at each CT value.