Crude extract (CE) and aqueous (AqF) and ethyl acetate (EtOAcF) fractions of Guazuma ulmifolia Lam., Sterculiaceae and the corresponding AqF, EtOAcF of Stryphnodendron adstringens (Mart.) Coville, Leguminosae were tested for their antiviral activity against poliovirus 1 (P-1) and bovine herpesvirus