Clinical and serological findings of Madariaga and Venezuelan equine encephalitis viral infections: a follow-up study five years after an outbreak in Panama by Carrera, J-P, Pittí, Y, Molares-Martínez, JC, Casal, E, Pereyra-Elías, R, Saenz, L, Guerrero, I, Galué, J, Rodriguez-Alvarez, F, Jackman, C, Pascale, JM, Armien, B, Weaver, SC, Donnelly, CA, Vittor, AY