We initially screened the serum samples with the Virochip pan viral detection microarray. This was done as a complement to the deep sequencing analysis and in order to compare the sensitivity of the two approaches. We included 7 blinded positive control samples that had been previously diagnosed in the clinic as being positive for DENV-2 (n = 4), DENV-1 (n = 1), or hepatitis A virus (HAV; n = 2). The Virochip successfully identified the correct virus in all of these positive controls, and in the case of the dengue virus positive samples, the correct serotype as well (Table 1) . We also identified ten samples positive for torque teno virus (TTV).