Abstract
Mouse antisera against the 16-day-old worm incubate and sera from 25-day infections in mice debilitated migrating flukes in recipient animals was measured by worm recovery and host mortality. Mouse antisomatic and 100-day infection sera produced no such effects. Host mortality was significantly lower after challenge in mice given 1 i.p. immunizing injection of the worm incubate; worm recovery was not significantly reduced. Injections at 2, 7, 12 and 24 h with the worm incubate elaborated over a 24-h period protected 75% of the mice from infection after challenge and reduced the worm burden by 83.3%.

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