Distention of the small intestine loops by liquid and gas content, along with contemporarily disappearance of the colon 'pneumatization', are characteristic for the severe secondary and for the tertiary peritonitis cases. One may suggest that either phenomena are developed due to, or connected, with dramatic changes of both the small and large intestines microflora quantity and quality.
However, I could find no data on this matter. I would be obliged for any help on the topic.