Inclusion Criteria

Patients must have:

• Documented HIV seronegativity.
• Good general health.
• No high-risk behavior for HIV infection.

Exclusion Criteria

Co-existing Condition:

Patients with the following symptoms or conditions are excluded:

• Postive PPD (unless a chest x-ray is negative and there is no suggestion of active or old pulmonary tuberculosis).
• Positive VDRL or HBsAG.
• No febrile illness within 1 week of study.

Concurrent Medication:

Excluded:

• Concomitant corticosteroids or other known immunosuppressive drugs.
• Other experimental agents.

Patients with the following prior conditions are excluded:

• History of clinically significant cardiac, pulmonary, hepatic, renal, neurologic, or autoimmune disease.

Prior Medication:

Excluded:

• Other immunization within 4 weeks prior to study entry.

Identifiable high-risk behavior for HIV infection.