Adult rabbits of 3 different strains were immunized by an intravenous injection of 7 mg BSA, followed 18 days later by a booster injection of 7 mg BSA and endotoxin. ‘Gris’ rabbits responded the best (86 responders) and ‘fauve de Bourgogne’ the worst (25), whereas ‘albinos’ were intermediate between the other 2 strains (48). After 100 mg of BSA, the poor response of ‘fauve de Bourgogne’ was slightly increased. These animals responded als
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