Inclusion Criteria:

Patients who have obvious symptoms and observation of post-surgical peritonitis, and meet the criteria described bellow.

1. Patients with >=38 degrees C, >=15,000/mm3 or <=3,000/mm3 of WBC and >=10mg/dL of CRP
2. Patients who have no abscess on the abdominal image
3. Patients who were administered antibacterial agents for 1 day or more, and show no sign of improvement
4. Patients who are 20 years old or older
5. Patients who have signed the agreement for participation in this study

Exclusion Criteria:

1. Patients who have a history of hypersensitivity to any of the ingredients of Immunoglobulin products
2. Patients who have a history of shock due to any of the ingredients of Immunoglobulin products
3. Patients who were administered immunoglobulin within 1 month before entry
4. Patients who were administered antibacterial agents for 1 day or more, and show signs of improvement
5. Patients with IgA deficiency
6. Patients with hereditary fructose intolerance
7. Patients with history of allergy or adverse effect for antibacterial agents
8. Patients who have underlying or concomitant disease that may seriously affect the assessment of this study
9. Patients who are or could be pregnant
10. Patients who have noninfectious fever, fungal infection or viral illness
11. Other patients who are judged to be inadequate to participate in this study by their physician