Table 1.

Threshold cycle (Ct) values of SARS-CoV-2 in wastewater samples.

Manhole no.	Grab samples				Composite (16-h) samples				Moore swab samples
	Nov. 2020		May 2021		Nov. 2020		May 2021		Nov. 2020		May 2021
	N	ORF1ab	N	ORF1ab	N	ORF1ab	N	ORF 1ab	N	ORF1ab	N	ORF 1ab
1	34.00	36.00	ND	ND	31.44	32.44	ND	ND	31.86	ND	34.71	ND
2	37.00	39.00	33.66	34.34	34.08	38.37	31.38	31.15	32.25	34.00	30.85	32.54
3	ND	ND	35.68	ND	ND	ND	35.07	35.51	35.94	38.13	31.13	34.02
4	ND	ND	32.12	33.78	35.51	37.21	31.04	33.37	35.08	38.63	30.93	34.45
5	ND	ND	34.19	ND	ND	ND	34.34	34.67	30.99	36.62	32.55	35.02
6	34.10	35.00	ND	ND	32.01	34.14	36.16	ND	31.43	32.76	35.90	37.05
7	38.00	34.87	32.96	33.41	31.50	34.05	32.26	33.41	31.68	32.56	30.87	33.35
8	ND	ND	34.71	35.32	34.40	ND	32.90	ND	33.17	ND	32.74	35.78
9	40.00	34.56	33.06	34.14	31.43	34.23	30.40	33.16	31.54	32.50	30.47	32.74
10	ND	ND	35.67	36.83	ND	ND	32.16	35.46	31.87	33.21	30.87	32.61
11	ND	ND	33.77	ND	34.43	ND	33.36	33.71	31.04	33.64	32.27	36.07
12	31.50	ND	33.06	35.33	31.92	33.69	33.94	35.40	30.26	31.06	30.54	31.40
13	36.78	39.00	ND	ND	35.88	38.8	33.68	ND	34.48	36.35	29.59	32.45
14	37.00	ND	35.67	ND	33.48	35.52	34.54	ND	32.91	34.84	34.07	37.15
15	ND	ND	33.69	ND	ND	ND	33.07	37.60	34.04	35.21	30.46	35.40
16	37.80	40.00	34.12	ND	37.67	37.81	32.39	33.81	34.67	36.93	31.27	34.97
17	33.98	37.00	32.94	36.66	33.56	35.37	32.77	32.93	32.69	34.52	30.92	33.98

ND: not detected.