Table 1. Interpretations of antibody testing and sample classification.

PRNT*	Zika or dengue IgM
	At least one positive (or equivocal)	Both negative
ZIKV ≥ 10, dengue < 10	Recent ZIKV infection	Prior ZIKV infection
ZIKV <10, dengue ≥ 10	Recent dengue infection	Prior dengue infection
ZIKV ≥ 10, dengue ≥ 10	Recent flavivirus infection	Prior flavivirus infection
ZIKV < 10, dengue < 10	No prior ZIKV or dengue exposure	No prior ZIKV or dengue exposure

*PRNT = Plaque-reduction neutralization test