“…Since the discovery of interferon (Isaacs & Lindenmann, 1957) and the demonstration that it could inhibit replication of a wide variety of viruses in vitro, considerable interest has been generated concerning its potential application as an antiviral agent in vivo (Arvin et al, 1976;Merigan, 1982;Merigan et al, 1968Merigan et al, , 1973Merigan et al, , 1978De Clercq & De Somer, 1968;Douglas & Betts, 1974;Dziewanowska & Pestka, 1982). Although the quantities and purity of interferon were limited, various groups have clearly demonstrated that in at least some virus diseases, treatment with exogenous interferon has a beneficial effect.…”