title: Genetic characterization of Venezuelan equine encephalitis virus from Bolivia, Ecuador and Peru: identification of a new subtype ID lineage.
abstract: Venezuelan equine encephalitis virus (VEEV) has been responsible for hundreds of thousands of human and equine cases of severe disease in the Americas. A passive surveillance study was conducted in Peru, Bolivia and Ecuador to determine the arboviral etiology of febrile illness. Patients with suspected viral-associated, acute, undifferentiated febrile illness of <7 days duration were enrolled in the study and blood samples were obtained from each patient and assayed by virus isolation. Demographic and clinical information from each patient was also obtained at the time of voluntary enrollment. In 2005-2007, cases of Venezuelan equine encephalitis (VEE) were diagnosed for the first time in residents of Bolivia; the patients did not report traveling, suggesting endemic circulation of VEEV in Bolivia. In 2001 and 2003, VEE cases were also identified in Ecuador. Since 1993, VEEV has been continuously isolated from patients in Loreto, Peru, and more recently (2005), in Madre de Dios, Peru. We performed phylogenetic analyses with VEEV from Bolivia, Ecuador and Peru and compared their relationships to strains from other parts of South America. We found that VEEV subtype ID Panama/Peru genotype is the predominant one circulating in Peru. We also demonstrated that VEEV subtype ID strains circulating in Ecuador belong to the Colombia/Venezuela genotype and VEEV from Madre de Dios, Peru and Cochabamba, Bolivia belong to a new ID genotype. In summary, we identified a new major lineage of enzootic VEEV subtype ID, information that could aid in the understanding of the emergence and evolution of VEEV in South America.
authors.affiliation: Naval Medical Research Center Detachment, Lima, Peru.
authors.forename: Patricia V
authors.initials: PV
authors.lastname: Aguilar
authors.forename: A Paige
authors.initials: AP
authors.lastname: Adams
authors.forename: Victor
authors.initials: V
authors.lastname: Suárez
authors.forename: Luis
authors.initials: L
authors.lastname: Beingolea
authors.forename: Jorge
authors.initials: J
authors.lastname: Vargas
authors.forename: Stephen
authors.initials: S
authors.lastname: Manock
authors.forename: Juan
authors.initials: J
authors.lastname: Freire
authors.forename: Willan R
authors.initials: WR
authors.lastname: Espinoza
authors.forename: Vidal
authors.initials: V
authors.lastname: Felices
authors.forename: Ana
authors.initials: A
authors.lastname: Diaz
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Liang
authors.forename: Yelin
authors.initials: Y
authors.lastname: Roca
authors.forename: Scott C
authors.initials: SC
authors.lastname: Weaver
authors.forename: Tadeusz J
authors.initials: TJ
authors.lastname: Kochel