Figure.

Average C_t values at SARS-CoV-2 viral loads of 3log₁₀ to 8log₁₀ copies/mL, Ireland, June 2020 (n = 8 assays)^a

C_t: cycle threshold; E: envelope; N: nucleocapsid; ORF: open reading frame; R: RNA-dependent RNA polymerase; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2.

^a While a total of nine SARS-CoV-2 real-time PCR assays were used in the study-participating laboratories, the Abbott RealTime SARS-CoV-2 assay reports cycle number values, which are not equivalent to C_t values and thus are not directly comparable. This assay was therefore excluded from the analysis.

^b When more than one laboratory used an assay (or targets in the assay), the average C_ts obtained across the laboratories are presented for each assay (or assay target).

Average C_t values at calculated viral loads of 3log₁₀ to 8log₁₀ copies/mL.