experiments on the intraperitoneal infection of f1 ( cba x c57bl/6 ) mice with bacteroids of the group fragilis in combination with e. coli have revealed the presence of a synergic effect leading to more pronounced ( greater frequency of abscess formation ) and even qualitatively new ( necrotic lesions of the liver ) pathological changes in comparison with those observed in monoinfections .
C0009450
infection
C0000833
abscess