Repeated stool and urine cultures have been negative for Salmonella suipestifer. The patient's shoulder was immobilized for three weeks. The swelling has decreased and the patient is improving gradually.The serum of the patient's parents was tested for agglutinins for Salmonella suipestifer. The father's serum was negative, but the mother agglutinated the organism isolated from the patient in a dilution of 1: 80. The family live in the country but do not keep pigs. BACTERIOLOGY The cultures isolated from these patients were gramnegative motile bacilli that fermented dextrose, man¬ like, maltose, rhamnose and xylose with the production of gas and failed to ferment lactose, saccharose, arabinose, trehalose and inosite. They all produced blacken¬ ing on lead acetate mediums. These organisms were not agglutinated or agglutinated only in low dilutions by paratyphoid serum but agglutinated well in serums produced by the injection into rabbits of group II Sal¬ monella suipestifer of human and porcine origin. They failed to agglutinate in immune serum produced by the injection of the specific phase of Salmonella suipestifer, group I. These cultures were identical with Salmonella
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