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The Effect of Irradiation of Trichinella Spiralis on Immunity and Its Public Health Implication

All available evidence indicates that the admonitions of Moses not to eat the flesh of swine and that of public-health officials to cook pork until it is well done have not been followed. In the United States, reports of various samples of the population reveal zoologic infections of Trichinella spiralis of from 10 to 20 per cent. There is sufficient evidence to warrant the conclusion that such infections have produced no clinical manifestations.

In spite of the many-times repreated warnings about the thorough cooking of pork and even laws forbidding the feeding of raw garbage to hogs, zoologic trichinosis in hogs and man persists. Accordingly, other means of controlling parasitism by this worm have been suggested, and prominent among them is the suggestion of Gould, Gomberg and Bethell (1954) that pork intended for consumption be irradiated. Aside from the cost and difficulty of establishing this process in the country, the question must be raised as to whether the low grade of the zoologie infection in question actually is not beneficial, conferring an immunity on the public and even the hogs to such an extent that the development of clinical symptoms, heavy infections and even death often is precluded.

¹ The Mayo Foundation, Rochester, Minnesota, is a part of the Graduate School of the University of Minnesota.

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