TABLE 3.

Estimated percent certainty of detection at specific concentrations of oocysts per gram of soil for IFA and PCR

Certainty of detection (%)	No. of oocysts/g detected
	IFA	PCR
50	13	1a
90	23	12
95	28	15
99	41	21
99.5	46	23
99.9	65	27
99.95	76	29
99.99	102	32

^aThe estimate was a fraction of an oocyst—the value presented is a rounding up of the original estimate.