[Preparation of diagnostic sera to enteroviruses 69, 70 and 71 having medical importance]

The use of enteroviruses, types 69, 70 and 71, purified with freon and concentrated with polyethylene glycol, for immunizing rabbits, following 4 immunization schedules, has made it possible to obtain active virus-neutralizing diagnostic sera with antibody titers of up to 1:2560, 1:806 and 1:9123, respectively.