Prophylactic effect of human T cell leukemia virus type I (HTLV-I) immune globulin (HTLVIG) against milkborne transmission of HTLV-I was investigated in a rabbit model. Four litters (A-D: 7, 5, 7, and 7 offspring, respectively) born to an HTLV-I-infected rabbit were used. Litters A and D were allowed to grow normally as controls, while litters B and C were given weekly intraperitoneal inoculation of HTLVIG four times until weaning at 4.5 weeks of age. Only 1 (8.3%) of the 12 HTLVIG-inoculated rabbits, compared with 6 (42.9%) of the 14 control rabbits, seroconverted for HTLV-I. Gene amplification detected the presence of HTLV-I proviral sequences in all of the seroconverted but in none of the seronegative rabbits. These results suggest that passive immunization is effective in preventing dam-to-offspring transmission of HTLV-I.
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