Abstract
Abstract It is a widely accepted opinion that when toxins or toxoids are used to immunize horses the subcutaneous route is more effective than the intravenous (1). Neill, Sugg and Richardson (2) found that also in guinea pigs antitoxin-formation is stimulated more readily by intracutaneous or subcutaneous than by intravenous injection of diphtheric toxoid. The experimental data on which these conclusions are based were not reported by the authors. Watanabe (3) reported that hens which received intravenous injections of purified diphtheric toxoid or tetanal toxin produced more antitoxin in a shorter time than those which received subcutaneous injections. The titer of antitoxin was maintained for a longer period of time in hens which were immunized by the intravenous route. When bacterial suspensions are employed as antigens the vascular route is the more effective one. Schultz and Swift (4) observed this relationship in rabbits immunized with non-hemolytic streptococci.
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