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A precocious line (PrEmag) of Eimeria magna in rabbits was obtained by selecting for early development of oocysts. The prepatent period was shortened by 46 h. The pathogenicity of PrEmag was substantially reduced and its reproductive potential was much lower (500 times) than that of the parent strain. Rabbits given 2500 oocysts of PrEmag were almost totally protected against a challenge with the parent strain. As in other precocious lines of coccidia from the rabbit, PrEmag showed morphological anomalies of the sporulated oocysts. Each sporocyst harboured one large refractile body instead of the two smaller ones in the parent strain.
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