FIELD: medicine, veterinary science, food industry. SUBSTANCE: method involves sensitization of latex of type core-envelope where core - polystyrene latex, envelope - copolymer of styrene and unsaturated carboxylic acid iron and/or cobalt, and/or nickel salt at mass ratio of links = 1:(0.3-0.5). Latex is kept preliminary in buffer ar pH 6.5-9.9 in presence of peroxide. Sensitization is carried out at pH 7.0-9.0 and incubated firstly at 37-56 C for 80-300 min, then at 2-8 C for 24-72 h. Prepared diagnosticum can be used for diagnosis of infectious and oncological diseases, dope-control, AIDS. EFFECT: improved method of preparing. 8 tbl
