Inclusion Criteria:

• Healthy, adult males and females;
• Age at least 18 years on the day of screening and no greater than 60 years on the day of the first vaccination;
• Available for follow up for the planned duration of the study (screening plus 18 months);
• In the opinion of the principal investigator or designee, has understood the information provided. Written informed consent needs to be given before any study-related procedures are performed;
• Willing to undergo HIV testing and counseling, and receive HIV test results;
• If sexually active female, using an effective method of contraception from screening until at least 4 months after last vaccination, and willing to undergo urine pregnancy test.
• If sexually active male, willing to use an effective method of contraception from screening until 4 months after the last vaccination.

Exclusion Criteria:

• Clinically relevant abnormality on history or examination including history of immunodeficiency or use of systemic corticosteroids, immunosuppressive, antiviral, anticancer, or other medications considered significant by the designated trial physician in last 6 months;
• Any acute or chronic medical condition requiring care of a physician (e.g.,, diabetes, coronary artery disease, rheumatologic illness, malignancy, substance abuse) that, in the opinion of the investigator, would preclude participation;
• Any of the following abnormal laboratory parameters that are moderate, severe, or very severe: haematology (hemoglobin, absolute neutrophil count, absolute lymphocyte count, absolute CD4/CD8 count, platelets); urinalysis, biochemistries (total bilirubin, creatinine, AST, ALT). Volunteers with mild laboratory abnormalities that are judged by the principal investigator or designee to be not clinically significant may be enrolled.
• Reported high- risk behaviour for HIV infection, defined as:
• Had unprotected vaginal or anal sex with a known HIV infected person or a casual partner (i.e., no continuing established relationship) within 6 months before vaccination
• Engaged in sex work for money or drugs within 6 months before vaccination
• Used injection drugs (illicit), or Acquired an STD within 6 months before vaccination ;
• If female, pregnant or planning a pregnancy within 4 months after last vaccination or lactating;
• Receipt of blood transfusion or blood products 6 months prior to vaccination;
• Receipt of a live attenuated vaccine (other than influenza) within 30 days or other vaccine within 14 days of vaccination;
• Participation in another clinical trial of an investigational product currently or within past 12 weeks or expected participation during this study;
• Receipt of another experimental HIV vaccine at any time;
• Infected with HIV-1 or HIV-2 as indicated by ELISA and/or RT-PCR;
• History of severe local or systemic reaction to vaccination or history of severe allergic reactions;
• Confirmed diagnosis of hepatitis B (surface antigen, HbsAg); hepatitis C (HCV antibodies) or active syphillis;
• History of grand-mal epilepsy, or currently taking anti-epileptics;
• In the opinion of the investigator, unlikely to comply with protocol.