The Venezuelan Encephalities virus (VEE) complex include 1AB, 1C, 1D, 1E serotypes, but the 1AB and IC serotypes are the only one related to epizooties. In Peru, the epizootic virus appeared in the 30th and the last appearance was in 1973 and the serotype isolated was 1AR In Loreto in the Peruvianjungle was isolated VEE ID serotype from human febrile illness; however, previous surveillance founded VEE antibodies in the same area. In this study we want to know the prevalence of VEE and Eastern Equine Encephalities virus (EEE) antibodies in humans and equines for the jungle area where the equine population were increasing lately. U sing neutralization test by plaque reduction we founded a variety of prevalence. In the human sera the highest prevalence for VEE was 57% in San Martin and for EEE was 62% in Loreto. In equines sera the highest prevalence for VEE was 68% and for EEE was 65% in L...

Since 1983, cases of diseased donkeys and horses with symptoms similar to those produced by alphaviruses were identified in two departments in northern Peru; however serological testing ruled out the presence of those viruses and attempts to isolate an agent were also unproductive. In 1997, also in northern Peru, two new orbiviruses were discovered, each recognized as a causative agent of neurological diseases in livestock and domestic animals and, at the same time, mosquitoes were found to be infected with these viruses. Peruvian horse sickness virus (PHSV) was isolated from pools of culicid mosquitoes, Aedes serratus and Psorophora ferox , and Yunnan virus (YUOV) was isolated from Aedes scapularis in the subtropical jungle (upper jungle) located on the slope between the east side of the Andes and the Amazonian basin in the Department of San Martín. Both viruses later were recovered fr...