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- [49] DURATION OF THE PRESERVATION OF IMMUNITY IN CHILDREN RECEIVING THE PRIMARY COMPLEX OF IMMUNIZATION WITH ADSORBED DIPHTHERIA-TETANUS TOXOID WITH REDUCED ANTIGEN CONTENT AND THE EVALUATION OF POSTPONED 2ND BOOSTER IMMUNIZATION AGAINST DIPHTHERIA AND TETANUS (THE RESULTS OF THE EPIDEMIOLOGIC TRIAL) ZHURNAL MIKROBIOLOGII EPIDEMIOLOGII I IMMUNOBIOLOGII, 1990, (09): : 56 - 61