Table 2.

Laboratory findings that may contribute in the differential diagnosis between dengue, chikungunya and Zika illnesses.

Laboratory finding	Arboviruses
	Chikungunya	Dengue	Zika
Leukopenia	+/++	++/+++	+/++
Lymphopenia	Usual	Unusual	Unusual
Thrombocytopenia	+/++	+++	–
Platelet count	Normal to low	Normal to very low	Normal to low
C-reactive protein	Elevated	Normal	Elevated
High hematocrit level	Infrequent	Warning sign	Infrequent

References: Brito and Cordeiro (2016); PAHO (2017).