Inclusion Criteria

Participants must have:

• Negative ELISA for HIV within 8 weeks of immunization.
• Normal history and physical examination.
• Availability for follow-up for planned duration of at least 24 months and willing to have 2 brief evaluations at 36 and 48 months.

Exclusion Criteria

Co-existing Condition:

Participants with the following symptoms or conditions are excluded:

• Active syphilis.

NOTE:

• AS PER AMENDMENT 6/25/97:
• Participant eligible if the serology is documented to be a false positive or due to adequately treated infection.
• Active tuberculosis (TB).

NOTE:

• Participant eligible if positive purified protein derivative and normal chest x-ray shows no evidence of TB and does not require isoniazid therapy.

Participants with the following prior conditions are excluded:

• History of immunodeficiency, chronic illness, malignancy, idiopathic anaphylaxis (AS PER AMENDMENT 6/25/97) or autoimmune disease. Participants with a history of cancer are excluded unless they have undergone surgery followed by a sufficient observation period to give a reasonable assurance of cure.
• Any history of anaphylaxis or history of other serious adverse reactions to vaccines.
• Immediate-type hypersensitivity reaction to egg products or neomycin (used to prepare ALVAC vaccines).

Prior Medication:

Excluded:

• Immunosuppressive medications.
• Live attenuated vaccines within 60 days of study.
• Use of investigational agents within 30 days prior to study.
• Prior receipt of HIV-1 vaccines or placebo recipient in a previous HIV vaccine trial.

Prior Treatment:

Excluded:

• Receipt of blood products or immunoglobulin within past 6 months.

Risk Behavior:

Excluded:

• Medical or psychiatric condition or occupational responsibilities that preclude participant compliance with the protocol. Specifically excluded are persons with a history of suicide attempts within 3 years, recent suicidal ideation or who have past or present psychosis.
• Medically indicated subunit or killed vaccines, e.g., influenza, pneumococcal, hepatitis A and B allowed provided administered more than 2 weeks from HIV study immunizations.