Immunity to Trichinella spiralis. VII. Resistance Stimulated by the Parenteral Stages of the Infection

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Abstract
In 3 experiments mice were given 3 i.v. injections of T. spiralis newborn larvae produced in vitro. Following a challenge infection of newborn larvae the mice were on the average 85% resistant, i.e., only 15% of the challenge larvae developed to encysted muscle stage larvae in these mice; when the challenge consisted of normal muscle larvae administered orally the mice were 51% resistant. Neither number nor longevity of adult worms in the intestines was affected by this immunization procedure.

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