Dogs were not clinically evaluated at other time points. At the end of the click here study period, the dogs were classified as either sick, dead, or cured. “Sick” dogs were those who were still clinically diseased with leishmaniasis, those still smear-positive for Leishmania parasites, or those who relapsed with disease during the follow-up and were sick at the evaluation. “Cured” dogs were those

with no clinical disease for at least 6 months of follow-up. Immunological readouts were not included as part of the Open Trial protocol. The study was conducted between May, 2006 and August, 2007. The same inclusion criteria were used for this trial as for Trial #1. Information on the breed and sex of dogs enrolled in the study are shown in Table S2 (Supplementary Data). Twenty pre-screened dogs were enrolled. They were sequentially allocated to one of three study cohorts without regard to their disease severity: Vaccine Group 1 (n = 10) received the vaccine containing 20 μg of Leish-111f + 25 μg Trichostatin A research buy of MPL in SE; Adjuvant Group 2 (n = 5) received the adjuvant formulation consisting of 25 μg of MPL in SE; and Saline Group 3 (n = 5) received saline alone. Vaccine, adjuvant alone, and saline were administered weekly, either four or

six times, via 0.5 mL subcutaneous injections. The Leish-111f and MPL-SE were obtained as described above. The first seven dogs enrolled (two Saline dogs; three Vaccine dogs; and two Adjuvant dogs) received four

injections each before the immunization schedule was expanded to six weekly injections through for the remaining nineteen dogs admitted into the trial. Rescue treatment (Glucantime or amphotericin B) was given to three Saline placebo dogs and seven dogs that failed to improve in the Vaccine or Adjuvant alone arms. Two veterinarians were engaged in this trial: One veterinarian, who was not blinded, prepared and performed the injections. The second veterinarian (“the evaluating veterinarian”) was blinded from group assignment until the completion of the study and performed all the clinical evaluations. Disease severity was calculated at Day 0 and at subsequent clinical examinations using a clinical score (CS) rubric (Table 1 and as previously described [29]). The dogs were kept in the clinic during the entire treatment period, and then returned to their owners. Following release to their owners, the dogs were monitored periodically until Day 180 with weekly clinical evaluations for the first six weeks and monthly evaluations thereafter. Hematological and biochemical analyses for hematocrit, blood hemoglobin, platelet, and serum alanine transaminase were performed at the time points indicated in Tables S3–6 in Supplementary Data.