Ag Detection in serum NP viral load NP viral load NP viral load NP viral load NP viral load NP viral load
High (CT<23)
Medium (23≤Ct<33)
Medium (23≤Ct<33)
Low (33≥Ct) Low (33≥Ct)
Overall sensitivity
85.7% (6/7) 75% (6/8) 75% (6/8) 14.3% (1/7) 14.3% (1/7) 59.1% (13/22)
Serum sampling from symptoms’ onset Serum sampling from symptoms’ onset Serum sampling from symptoms’ onset Serum sampling from symptoms’ onset Serum sampling from symptoms’ onset Serum sampling from symptoms’ onset
< 7 Between 7 and 14 Between 7 and 14 > 14 > 14 Overall sensitivity
90% (18/20) 66.7% (6/9) 66.7% (6/9) 33.3% (2/6) 33.3% (2/6) 74.3% 26/35
Presence of symptoms Presence of symptoms Presence of symptoms Presence of symptoms Presence of symptoms Presence of symptoms
yes yes no no Overall sensitivity Overall sensitivity
73% (27/37) 73% (27/37)
0% (0/3)
0% (0/3)
67.5% 27/40 67.5% 27/40