All eligible patients will be identified through the pharmacy database and microbiology database on daily basis. The investigator will obtain written consent from each potential patient. Consent must be documented by the patient's dated signature on a consent form along with the dated signature of the person conducting the consent discussion. If the patient is in the state that can not make decision, the written consent of a parent, legal guardian or legal representative must be obtained. Intervention: The eligible patients will receive 100 mg of tigecycline intravenous infusion for 30 minutes followed by 50 mg every 12 hours for 7 to 14 days.