Table 4.

Effect of cycle duration upon the degradation of Adenovirus DNA

Exposure time	Mean Cycle Threshold (CT) valuea(n = 4)
	Stainless steel sheet	Ceramic tile
0 min (control)	17	18
1 min	22	22
2 min	25	27
3 min	27	27
4 min	33	34
5 min	31	45
6 min	45	45

^aA 3.3 CT increase equates to a 1 log reduction in detectable viral genome. A CT value of 45 is the assay end-point and when DNA is considered undetectable.