Table 1.

Agreement between URT samples collected in a repeatedly in patients over a short time-interval.

	Same day(n = 272)	1-3 day(n = 826)	4-6 days(n = 489)	7-10 days(n = 585)
Concordant Negative results	243	750	430	516
Concordant Positive results	24	21	7	20
Negative to Positive transition	2	46	38	28
Positive to Negative transition	3	9	14	21
Concordant negative agreement	99.2%	94.2%	91.9%	94.9%
Concordant positive agreement	88.9%	70%	33.3%	48.8%