Calves were sensitized to horse serum in Freund's complete adjuvant and were subjected to acute systemic anaphylactic shock. Increased packed cell volume and potassium ion concentration together with severe neutropenia were observed to accompany the systemic hypotension. The hemoconcentration and hyperkalemia were not inhibited by antihistaminic or antiserotonin drugs, but were strongly inhibited by pretreatment of the calves with sodium meclofenamate and by disodium cromoglycate (DSCG) given simultaneously with diethylcarbamazine (DECC). In contrast there was no measurable diminution of the leukopenia by any inhibitor drug tested
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