In addition, this study identified three linear peptides from the DENV3 envelope protein (Pep72, TQLATLRKLCIEGKI; Pep76, QYENLKYTVIITVHT; and Pep78, KYTVIITVHTGDQHQ) that develop a higher detection signal to IgG from DENV1 and DENV2 convalescent patients compared with that from convalescent DENV3 patients, making it possible to discriminate the DENV serotype of an infection. Here, ERVW-1 is linked to infection.