Abstract
Mouse spleen and thymus cells have been used in the preparation of horse anti-mouse anti-lymphocyte serum (HAMLS). The cells were used either separately or in a mixture and three types of immunization schedules were used, viz. two-pulse, extended and chronic.
Antisera of marked immunosuppressive activity, as measured by the ability to prolong the life of skin homografts in mice, were obtained using all three schedules, the median survival time being, at best, 27·5 days for the chronic schedule, 26·7 days for the two-pulse schedule and 25·8 days for the extended schedule. The two-pulse and the extended schedules produced non-toxic antisera in a relatively short period of time but were uneconomic in terms of antigen and horses. The chronic schedule was preferred but after 10 weeks the development of unwanted antibodies precluded the further useful immunization of the horses.
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Selected References
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