Inclusion Criteria

- INCLUSION CRITERIA:

The study will be limited to the medical, surgical, neurosurgical, trauma, and general
ICUs of the participating institutions. Burn ICUs are not eligible for this study.

Subjects who meet all of the following criteria are eligible for enrollment into the
study:

1. Subject, or legal representative, has given written informed consent.

2. Subject has developed a new pulmonary infiltrate (confirmed by radiology), after ICU
admission.

3. Subject has been hospitalized at least 3 days.

4. CPIS less than or equal to 6.

5. 18 years of age or older.

EXCLUSION CRITERIA:

Subjects who meet any of the following criteria are ineligible for participation in the
study:

1. Burn patients.

2. Cystic fibrosis patients.

3. Bone marrow or solid organ transplant patients.

4. Neutropenia from any cause (absolute neutrophil count (ANC) < 500), or likely to
become neutropenic within 7 days.

5. Known or suspected Human Immunodeficiency Virus (HIV) infection (HIV test is not
required).

6. Suspected or proven extrapulmonary infection site requiring antibiotic therapy.

7. History of anaphylaxis to penicillin or cephalosporins.

8. History of anaphylaxis to meropenem (any component of the formulation), or other
carbapenems (e.g., imipenem).

9. On systemic antibiotics for more than 7 consecutive days during the previous 30 days.

10. Received more than two doses of systemic antibiotics within the past 24 hours (other
than those used for surgical prophylaxis).

11. Pregnant or lactating. (Women of childbearing potential must have a negative serum or
urine pregnancy test within the 7 days prior to the first dose of antibiotics.)

12. On mechanical ventilation for > 7 consecutive days during the previous 30 days.

13. Unlikely to survive past Day 7 of the study (as determined by the primary care team).

14. Previous enrollment in this study.