Table 2.

Ct values of RdRp gene amplification of the PM₁₀ filter RNA extraction from hospital ward (four replicates) and from spiked control filters, both clean/new and used/environmental PM_10, sampled in 2018; N.D. = not detected.

PM10 Sample filter	Ct for RdRp replicate 1	Ct for RdRp replicate 2	Ct for RdRp replicate 3	Ct for RdRp replicate 4
June 19, 2020	37.4	36.7	37.7	37.1
June 20, 2020	38.5	N.D.	38.3	N.D.
June 21, 2020	40.3	N.D.	38.3	N.D.
June 22, 2020	40.5	N.D.	N.D.	N.D.
June 23, 2020	N.D.	39.1	N.D.	N.D.
Clean spiked E+6 copies	35.1
Used spiked E+6 copies	39.1
Used spiked E+8 copies	37.0	38.4