Table A1:

Timeline of counts of positive and negative tests for COVID-19 and cases per onset date in Alberta, Canada on 3/28/2020

Lab report date /date of onset for incident case (t)	test positive (Yt*)#	test negative (nt- Yt*)	Observed incident cases of COVID-19 (Ct*)#
2020-03-06	1	61	1
2020-03-07	2	275	0
2020-03-08	3	440	0
2020-03-09	6	718	6
2020-03-10	6	966	9
2020-03-11	5	961	7
2020-03-12	2	1144	2
2020-03-13	8	1419	8
2020-03-14	19	1591	19
2020-03-15	9	1784	10
2020-03-16	20	1306	24
2020-03-17	8	2137	15
2020-03-18	27	2860	28
2020-03-19	31	2774	29
2020-03-20	31	3392	45
2020-03-21	26	3539	40
2020-03-22	29	2613	45
2020-03-23	36	2713	53
2020-03-24	50	3131	62
2020-03-25	51	1842	77
2020-03-26	31	1121	48
2020-03-27	11	593	14

^#the number of persons who tested positive at time t is not the same as number with persons with onset of symptoms at time t (used in epidemic curve); the lack of agreement two counts and their totals is due to lag in reporting and investigation of date of onset, a situation that is expected in the middle of epidemic at the time of compilation of these data