Table 2.

Literature results on presence of SARS-CoV-2 in untreated wastewater.

References	Location	Number of points examined	Period of examination	Samples Positive (total number of samples)	Ct value
Or et al. (2020)	Israel	17	10/03/2010−21/04/2020	10 (26)	32.76−38.5
Wu et al. (2020a)	U.S.A. (Massachusetts)	2	08/01/2020−25/03/2020	10 (12)	33.87−38.39
Rimoldi et al. (2020)	Italy	3	14/04/2020−22/04/2020	4 (12)	n.a.
Ahmed et al. (2020)	Australia	3	20/03/2020−01/04/2020	2 (9)	37.5−39a
Medema et al. (2020)	Netherlands	7	05/02/2020−16/03/2020	14 (24)	n.a.
Randazzo et al. (2020a)	Spain	3	12/02/2020−14/04/2020	13 (15)	34.00–37.84
Randazzo et al. (2020b)	Spain	6	12/03/2020−14/04/2020	37 (72)	34.00–40.00
Wurtzer et al. (2020)	France	3	05/03/2020−23/04/2020	100 % of samples positiveb	n.a.
La Rosa et al. (2020b)	Italy	4	03/02/2020−02/04/2020	6 (12)	n.a.
Kocamemi et al. (2020a)	Turkey	9	21/04/2020−25/04/2020	7 (9)	34.67−39.54 a
Kumar et al. (2020)	India	1	08/05/2020−27/05/2020	2 (2)	32.65−39.56
Arora et al. (2020)	India	8	04/05/2020−12/06/2020	6 (17)	5.19–37.52
Balboa et al. (2020)	Spain	1	06/04/2020−21/04/2020	7 (7)	33.61−39.60
Haramoto et al. (2020)	Japan	1	17/03/2020−07/05/2020	0 (5)	n.a.
Green et al. (2020)	U.S.A. (New York)	11	06/05/2020 – 13/05/2020	18 (22)	n.a.

n.a.: not available.

^aExpressed as Cq.

^bTotal number of samples not available.