. Fig. 5. Xormal ovary. (Redrawn from Eettger, Kirkpatrick and Jones) has been batched from eggs from a particular flock of bens is proof enough of infection in the flock, providing that there is a reasonable certainty that contamination has not been introduced by outside sources or from infected incubators or brooders. Detection of the characteristic pullorum-infected ovaries, on post mortem examina- tion, is definite proof that the disease is prevalent in the flock. Bac-

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