(19)

(11)

EP 0 070 852 A1

(12)

(43) Date of publication: 09.02.1983 Bulletin 1983/06 (21) Application number: 82900377.0 (22) Date of filing: 08.02.1982

(51) International Patent Classification (IPC):  A01N 25/ 34( . ) A01N 53/ 00( . ) (86) International application number: PCT/GB1982/000031 (87) International publication number: WO 1982/002647 (19.08.1982 Gazette 1982/20)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 09.02.1981 ZA 19810000848 (71) Applicant: THE WELLCOME FOUNDATION LIMITED London NW1 2BP (GB)	(72) Inventors: GIESELBACH, Marinus Lukas Munnik Kempton Park, Transvaal (ZA) HOY, John Johannesburg, Transvaal (ZA) (74) Representative: Berg, Wilhelm, Dr.  Patentanwälte Dr. Berg Dipl.-Ing. Stapf Dipl.-Ing. Schwabe Dr. Dr. Sandmair Postfach 86 02 45 Stuntzstrasse 16 D-8000 München 86 D-8000 München 86 (DE)