Figure 3. Independent test data, with primary and secondary infection classification according to the CPqAM criteria, with a solid line representing the previously designed classifier, for inspection.

Test data were obtained from 50 additional patients in the cohort. As with the training data, all quantified samples were pooled and those that had been obtained more than 20 days after the onset of symptoms were ignored, resulting in 51 primary and 61 secondary infection samples, according to the CPqAM criteria, for a total of 112 test samples.