“…Among the antiviral agents which have been introduced during recent years, the biguanide derivative Nl,Nl-anhydrobis(,8-hydroxyethyl)biguanide hydrochloride (ABOB) has been investigated in the treatment of various human virus infections (1, 2, 3,8,19) and has been claimed to be clinically effective in the chemoprophylaxis of influenza virus infections (4, 16). Additional biguanides have also been tested in tissue cultures (7), although no evidence has been presented regarding the activity of these compounds in vivo.…”