“…Resistance to ether and/or chloroform, inactivation by RNase but not by DNase, resistance to heat, divalent cationic (heat) stabilisation, acid resistance, resistance to inhibition by IUDR, green cytoplasmic staining by acridine orange, and/or the appearance of cytoplasmic inclusion bodies and/or syncytia by histological examination of infected cell cultures were reported (Olson and Kerr, 1966;Taylor et al, 1966;Ahne et al, 1974;van der Heide andKalbac, 1975;Rossie?al, 1969;Glassetai, 1973;Bottino etal, 1975;Carboni etal, 1975).…”