FCGR2A and dengue disease: Some of the non acute dengue patients (serum sample no. 23, 28, 30, 38, 73, 74, 77, 78, 79, Table 4) exhibited heterotypic neutralizing activity using BHK cells but monotypic neutralizing activity using FcγR-expressing cells, as those observed in patients with acute secondary dengue infection (Table 3).