To describe the safety of the 2004-2005 pediatric formulation of the inactivated, split-virion influenza vaccine Fluzone®, given in the two-dose schedule in accordance with the Package Insert, in children aged ≥ 6 months to < 36 months.

To describe the immunogenicity of the 2004-2005 inactivated, split-virion influenza vaccine Fluzone®, administered in a two-dose schedule in accordance with the Package Insert, in children aged ≥ 6 months to < 36 months

To provide the Centers for Biologic Evaluation and Research (CBER) with sera collected from healthy children receiving the 2004-2005 formulation of the inactivated, split-virion influenza vaccine Fluzone® for further study by the Food and Drug Administration (FDA), Centers for Disease Control and Prevention (CDC), and the World Health Organization (WHO).

Inclusion Criteria :

• Participant is aged ≥ 6 months to < 36 months.
• Participant is considered to be in good health on the basis of reported medical history and limited physical examination.
• Participant is available for the duration of the study.
• Parent/guardian is willing and able to provide informed consent.
• Parent/guardian is willing and able to meet protocol requirements.

Exclusion Criteria :

• Reported allergy to egg proteins, chicken proteins, or any other constituent of the vaccine.
• Previous history of influenza vaccination or documented history of influenza infection.
• An acute illness with or without fever (temperature > 100.4 °F rectal) in the 72 hours preceding enrollment in the trial (defer enrollment).
• Clinically significant findings in vital signs or review of systems (investigator judgment; defer or exclude).
• Participation in any other clinical trial within 30 days prior to enrollment up to termination of the subject's participation in the study.
• Known or suspected impairment of immunologic function, or receipt of immunosuppressive therapy or immunoglobulin since birth.
• Personal or immediate family history of congenital immune deficiency.
• Developmental delay, neurologic disorder, or seizure disorder.
• Chronic medical, congenital, or developmental disorder.
• Known human immunodeficiency virus (HIV)-positive mother.
• Prior history of Guillain-Barré syndrome.
• Any condition which, in the opinion of the investigator, would pose a health risk to the subject or interfere with the evaluation of the vaccine.
• Any vaccination in the 14 days preceding enrollment in the study or scheduled between Visit 1 and Visit 3.

Adverse event data were collected from the day of vaccination to Day 42 post-vaccination.