Table 1. Increase in the probability of obtaining one or more positive qPCR results with the number of swabs analyzed.

Number of swabs analyzed	Probability* of PCR positive tests (expressed as percentages)
	% of one positive test (95% CI)	% of two positive tests (95% CI)	% of three positive test (95% CI)	% of four positive test (95% CI)
1	80.17 (79.81 to 80.52)
2	92.16 (91.96 to 92.41)	67.67 (67.37 to 67.98)
3	97.1 (96.25 to 97.24)	82.7 (82.47 to 82.95)	60.19 (59.95 to 60.43)
4	98.69 (98.57 to 98.80)	92.01 (91.90 to 92.10)	73.33 (73.28 to 73.38)	55.82 (55.67 to 55.97)

* A bootstrap with 1000 loops was used