Inclusion Criteria:  Man or woman ≥18 years old. Written informed consent obtained from the patient prior to performance of any study-specific procedure. History of at least one episode of HSV-2 genital herpes lesions in the 12 months preceding the screening, and seropositive for HSV-2 as determined by Western blot OR PCR-positive for HSV-2 (newly diagnosed patients). Patients who are medically stable in the opinion of the investigator. Patients who, in the opinion of the investigator, are able to understand and comply with the study requirements (attend regular telephone calls/study site visits/home visits/self-completion of questionnaires, self-swabbing). Seronegative for HIV, as determined by laboratory testing. Patients documented to be positive to HIV will not be eligible for study participation  Exclusion Criteria:  Prior receipt of a vaccine or candidate vaccine containing HSV antigens. Immunocompromised patients, as per medical history and investigator judgement. Other genital tract disorders or sexually transmitted diseases that may interfere with the assessment of the study (as per investigator's judgement).