A vaccine to prevent infection with the Human Immunodeficiency Virus (HIV) is urgently needed. Worldwide, most HIV infections occur through sex between a man and woman. The vaccine in this study consists of a protein from HIV that has been synthetically produced and linked to a protein that boosts immune responses. It has not been tested in humans before, but it is expected (from animal studies) that direct application into the female genital tract (via the vagina) as liquid drops, will provoke immune protection at the site of HIV infection. This is less applicable to men, therefore only healthy, HIV negative women will be recruited. The investigators will recruit at one site, which is a university vaccine research centre with experience of running similar trials. The study will last 24 weeks during which subjects will have blood samples taken on six visits, and three immunisations over 12 weeks in which 1 millilitres of vaccine is placed into the vaginal by inserting a small plastic syringe. The purpose of this initial small study is to monitor safety of the vaccine and to determine whether it is appropriate to continue into future, larger studies in which the immune response to the vaccine is measured.

This hypothesis-generating, first-in-human, Phase 1 study will be conducted according to the Standard Operating Procedures (SOPs) of St George's. The purpose of the study is to determine the immediate safety and reactogenicity of the vaccine, to guide future larger Phase 1/2 studies of safety and efficacy.

Eight subjects will be included to receive 3 cervico-vaginal topical applications of 100µg of CN54gp140-hsp70 conjugate vaccine in 1.0 mL physiological buffer, administered as topical intra-vaginal drops on day 0, and at 4 and 12 weeks after the first immunisation. The study will consist of 1 pre-study screening visit, 3 immunisation visits, and 2 follow-up visits over a total period of 20 weeks. Subjects will be recruited as one cohort in two groups of four. The dose of antigens and immunisation schedule has been selected based on pre-clinical and clinical experience with the same HIV envelope protein.

Each subject's medical history (including past and present illnesses, current medications, family medical history) will be formally assessed and recorded at screening. Volunteers' age, gender, height, weight and ethnic origin will be recorded. A full physical examination will be conducted by a registered medical practitioner at screening and the final study visit. Regular assessments of vital signs (pulse, blood pressure, temperature) will be made on all visits.

Diary cards, investigator-prompted recall of events, laboratory tests (haematology, biochemistry) and direct visualisation of immunisation site will be used to identify Adverse Events. Frequency of vaccine-related Adverse Events is the Primary Study Endpoint.

Before and after each immunisation visit (0, 4 and 12 weeks) blood samples will be obtained for collection of serum and for separation of PBMCs for cellular assays. At each time point, vaginal and cervical secretions will be taken. All immunology assays are exploratory and are not study endpoints. HIV serology and DNA detection will be repeated at the final visit to detect subjects who may have contracted HIV infection during the study period, and who may therefore have developed antibody and T-cell responses due to the HIV infection that would interfere with exploratory immunology assays.

Inclusion Criteria:

• Adult female volunteers, 18 to 45 years of age, who have signed an informed consent form following a detailed written explanation of participation in the protocol.
• Volunteers who are in good health as determined by medical history, physical examination and clinical judgement.
• Available for the duration of the study.
• Women who, if capable of becoming pregnant during the study, have agreed to have a pregnancy test immediately before immunisation, and to use appropriate contraception methods during the whole study period. Appropriate contraception shall include physician-prescribed oral hormonal agents, barrier contraceptives, regular and consistent use of condoms without spermicidal agents, or intrauterine devices only.
• Agree not to undertake any vaginal practices other than receptive intercourse with a male or use of sanitary tampons during menses. Use of condoms without spermicidal agents is encouraged.
• Have not donated blood during 3 months prior to study entry and agree to not donate for 3 months after the end of their participation in the study

Exclusion Criteria:

• They have hypersensitivity to any component of the vaccine used in this study.
• They are found to be HIV antibody or HIV proviral DNA positive at the time of initial screening.
• They have a known or suspected history of cervico-vaginal disease, malignancy or abnormality discovered at time of screening, or who have undergone a Letts procedure.
• They present in the samples obtained at the screening visit:
• a clinically significant abnormality in the haematological or biochemical assays.
• Positive tests for Hepatitis B and/or C infection
• Positive tests for genital infections: Chlamydia trachomatis, Neisseria gonorrhoea, Treponema pallidum (syphilis).
• An abnormal value will be defined by the ranges quoted by pathology laboratory.
• They have a known or suspected impairment of lung, heart, liver, kidney, blood disorders or immune dysfunction.
• They are receiving immunosuppressive therapy (including systemic steroids).
• They are receiving any regular medications via vaginal route.
• They have any acute infections (including fever greater than or equal to 38°C) or any chronic disease.
• They present a current problem with substance abuse or with a history of substance abuse, which, in the opinion of the investigator, might interfere with participation in the study.
• They have any condition that, in the opinion of the investigator, might interfere with the evaluation of the study objectives.
• They have received an investigational agent within 3 months prior to study entry.
• They cannot speak fluent English
• They are planning to leave the area of the study site prior to the end of the study period, or are likely not to complete the study.