“…However, the frequent reports of toxic responses to bacterial vaccines, together with difficulties in standardizing preparations [56] is leading to a greater interest in more well defined agents including interferons [4,5] and synthetic compounds such as azimexon [42]. However, the frequent reports of toxic responses to bacterial vaccines, together with difficulties in standardizing preparations [56] is leading to a greater interest in more well defined agents including interferons [4,5] and synthetic compounds such as azimexon [42].…”