7. Which bacteria are involved in peritonitis of bowel origin? Posted on May 19, 2023 Correct answer: (1) Bacteroides.(2) Pseudomonas.(3) Clostridium.(4) Streptococcus.(5) Proteus.(6) Escherichia coli.(7) Klebsiella. Post navigation Previous Post6. What is the pathology of peritonitis? Next Post8. Which bacteria are involved in peritonitis of gynaecological origin?