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. 2020 Nov 10;758:143578. doi: 10.1016/j.scitotenv.2020.143578

Table 2.

Summary of samples deemed positive for SARS-CoV-2 by qRT-PCR assays.

Date WWTPa Total confirmed cases
per 100,000 people
Efficiency of the detection process
qRT-PCR
Ishikawa Toyama Concentration
RNA extraction
qRT-PCR
Total
CDCN2
CDCN3 NIID
% % % copies/Lb
March 19 A 0.4 0.0 260 72 190 Neg. Pos. Neg.
March 27 B 0.5 0.0 76 50 38 Neg. Pos. Neg.
April 3 D 1.4 0.8 130 100 130 Pos. Pos. Pos.
April 16 B 12.2 5.1 10 49 4.9 Pos. Neg. Neg.
April 21 C 15.7 10.9 88 41 36 Neg. Pos. Neg.
April 23 B 17.4 11.0 36 50 18 Neg. Pos. Neg.
April 24 D 18.9 14.3 52 31 16 Neg. Neg. Pos.
April 30 A 21.9 18.1 41 190 76 Pos. 1.2 × 104 1.3 × 104
April 30 B 21.9 18.1 43 190 82 Pos. 1.2 × 104 Neg.
May 1 D 22.0 19.2 49 120 60 Pos. Pos. Neg.
May 7 A 23.7 20.9 45 120 52 1.8 × 104 Neg. Neg.
May 7 B 23.7 20.9 110 110 120 Pos. Pos. Pos.
May 8 D 24.1 21.0 170 190 310 Pos. Neg. Neg.
May 14 A 24.8 21.1 17 130 22 Pos. Pos. Neg.
May 15 D 24.8 21.3 40 170 67 Pos. Neg. Neg.
May 15 E 24.8 21.3 42 130 57 Neg. 3.5 × 104 Neg.
May 21 B 25.4 21.6 31 130 40 Neg. Pos. Neg.
May 22 D 25.5 21.6 25 170 42 Pos. Pos. Neg.
May 22 E 25.5 21.6 33 130 44 Pos. Pos. Neg.
May 28 A 25.9 21.6 27 120 31 Neg. Pos. Neg.
May 29 D 26.0 21.6 26 56 14 Neg. Pos. Neg.
a

WWTPs A, B, and C were located in Ishikawa prefecture, while D and E were located in Toyama prefecture.

b

Quantification was done only if the detected SARS-CoV-2 RNA concentration was >1.0 × 101 copies/reaction. Pos.: Positive with a detected concentration of 1.0 × 100–1.0 × 101 copies/reaction; Neg.: Negative.