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Parasite colonization of the bursa of Fabricius in the chickens (Groups 1 and 2). The index of infection was determined as follows: 0, no parsite observed; 1, small numbers of parasites (10% of the tissue colonized); 2, moderate numbers of parasites (10 to 50% of the tissue colonized); 3, large numbers of parasites (> 50% of the tissue colonized). Date are presented as the mean + SD.
