Table 2.

Average false positive reads across 100 experiments for each viral class.

Class	FP/1 M reads (Balanced)	FP/1 M reads (Unbalanced)	FP% thresholda
Coronaviridae	81.6	66.6	0.0405
Influenza	1.9	6	0.000807
Metapneumovirus	2	1	0.000154
Rhinovirus	35.5	53.9	0.0418
SARS-CoV-2	2	1	0.000213

FP = False positive, 1 M = 1 million, Balanced = 100 experiments with equal proportion of reads from each class, Unbalanced = Variable proportion of reads from all classes and no reads from the test class.

^aThese thresholds represent 0.99 quantile for FP% for that class.