Table 2.

MADV and VEEV Seroprevalence by Survey Year as Determined by Plaque Reduction Neutralization Tests

Year	Alphavirus Seronegative, No. (%)	MADV Seropositive, No. (%)	VEEV Seropositive, No. (%)	Dual Infection, No. (%)
2010 (n = 65)	35 (53.8)	14 (21.5)	16 (24.6)	0
2015 (n = 65)	29a (44.6)	18a (27.7)	24 (36.9)	6 (9.2)

Abbreviations: MADV, Madariaga virus; VEEV, Venezuelan equine encephalitis virus.

^aThere were 28 alphavirus-seronegative participants, but 1 MADV seroreversion rendered that individual also seronegative. The other individual with MADV seroreversion became VEEV positive in 2015.