(19)

(11)

EP 0 433 353 A1

(12)

(43) Date of publication: 26.06.1991 Bulletin 1991/26 (21) Application number: 89910134.0 (22) Date of filing: 07.09.1989

(51) International Patent Classification (IPC):  A23L 3/ 3571( . ) A61K 38/ 00( . ) A61K 38/ 48( . ) A61P 31/ 12( . ) A61P 37/ 04( . ) A61K 35/ 76( . ) A61K 38/ 46( . ) A61L 2/ 16( . ) A61P 31/ 16( . ) (86) International application number: PCT/GB1989/001053 (87) International publication number: WO 1990/002562 (22.03.1990 Gazette 1990/07)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 08.09.1988 GB 19880021049 (71) Applicants: PUBLIC HEALTH LABORATORY SERVICE BOARD London NW19 5EQ (GB) RETROSCREEN LIMITED London E1 2AD (GB)	(72) Inventors: SUTTON, Peter, Morgan Wiltshire SP1 2RL (GB) OXFORD, John, Sydney London N12 7DY (GB) (74) Representative: Ritter, Stephen David, et al  Mathys & Squire 100 Grays Inn Road London WC1X 8AL London WC1X 8AL (GB)