Maladies virales du cheval au Pantanal, Brésil. Etudes réalisées entre 1990 et 1995 = Equine viral diseases in the Pantanal, Brazil. Studies carried out from 1990 to 1995= Enfermedades virales equinas en Pantanal, Brasil. Estudios desarrollados de 1990 a 1995

viruses are acquired when young horses mix with older ones or through local management practices.