Abstract
Within recent years the bacillary white diarrhea of young chicks has assumed an unanticipated prominence among poultry scourges. It is caused by a specific organism,<i>Bacterium pullorum</i>, and is transmitted directly from the mother hen to the chick, through the infected egg. This newly emphasized disease of the domestic animals presents a somewhat exceptional type of carrier problem.<sup>1</sup>The hen which has acquired the infection with the organism either early in her existence, or after full maturity, becomes a permanent source of danger to the species. It has now been clearly demonstrated that the permanent seat of infection is the ovary, which in many instances becomes so greatly involved that the ova are discolored and misshapen, and the ovary presents a decidedly pathologic appearance. The ova harbor the disease organism. Furthermore, ova which develop into apparently normal yolks frequently carry the organism,<i>Bacterium pullorum</i>, to the time of full
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