(19)

(11)

EP 0 418 277 A1

(12)

(43) Date of publication: 27.03.1991 Bulletin 1991/13 (21) Application number: 89906155.0 (22) Date of filing: 15.05.1989

(51) International Patent Classification (IPC):  C12Q 1/ 68( . ) (86) International application number: PCT/GB1989/000522 (87) International publication number: WO 1989/011545 (30.11.1989 Gazette 1989/28)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.05.1988 GB 19880011608 (71) Applicant: INSTITUTE FOR ANIMAL HEALTH LIMITED Berkshire RG16 oNN (GB)	(72) Inventors: HOPE, James West Mains Road, Edinburgh EH9 3JF (GB) HUNTER, Nora West Mains Road, Edinburgh EH9 3JF (GB) (74) Representative: Bassett, Richard Simon, et al  ERIC POTTER & CLARKSON St. Mary's Court St. Mary's Gate Nottingham NG1 1LE Nottingham NG1 1LE (GB)