Inclusion Criteria:

• Clinical diagnosis, documented by medical history and physical examination, is acute otitis media <=1 week
• Clinical signs and symptoms include >=1 of the following: ear pain; ear fullness, decreased hearing, or discharge from the external auditory canal (following acute perforation of the tympanic membrane).
• At least two of the following conditions are present in at least one ear: bulging tympanic membrane, which may have redness; loss of the normal light reflex and tympanic membrane landmarks and abnormal tympanic membrane mobility on biphasic pneumatic otoscopy, due to the presence of pus or fluid behind it and edema of the tympanic membrane.
• Have evidence of middle ear fluid demonstrated by acoustic reflect-tympometry.
• Generally in good health based on medical history, vital signs, physical exam, and historical laboratory results

Exclusion Criteria:

• Previous enrollment in this study.
• Enrollment in any other investigational study using unapproved products or unapproved doses, including investigational vaccines in the previous four weeks prior to study start.
• Hypersensitivity reactions to cefdinir, other cephalosporins, penicillins, other drugs, and/or sensitivity to multiple allergens.
• Presence of tympanostomy tubes or otitis externa at Evaluation 1.
• Systemic treatment with any anti-infective agent within 7 days (14 days for azithromycin) prior to Evaluation 1 or during the study.
• Treatment with a long-acting injectable antimicrobial agent (e.g., penicillin G benzathine) within 4 weeks prior to study drug administration.
• Concomitant infection, that requires additional antimicrobial therapy.
• Evidence of chronic, suppurative otitis media.
• Evidence of a physiologic, anatomic, or immunologic defect, which would interfere with resolution of this episode of acute otitis media.
• Presence of a disease, complicating factor (e.g., mastoiditis), or structural abnormality that would preclude evaluation of the subject's therapeutic response.
• Known, severe renal impairment (i.e., creatinine clearance < 30 mUmid1.73 m2).
• History of Augmentin-associated cholestatic jaundicehepatic dysfunction.