Management of purulent wounds is a problem that requires particular attention: wounds are a common injury type for which suppurative complications are frequent, mortality rates are high and antimicrobial therapy may be ineffective due to the presence of drug-resistant bacteria in the wound. In this work we have studied the effectiveness of wound treatment with the leaf extract of transgenic Kalanchoe pinnata modified to produce antimicrobial peptide cecropin P1. Purulent wounds infected with Staphylococcus aureus were modeled in Wistar rats. Four groups of animals were formed, with 10 animals in each group. In all groups, the wounds were cleansed with 3 % hydrogen peroxide solution once a day; all groups except the controls received additional treatment. Group 2 received 10 % cefazolin solution, group 3 received kalanchoe juice, group 4 received the juice of cecropin P1-producing kalanchoe. Histologic stains of biopsy samples were performed after rats were sacrificed by anesthetic overdose on days 3, 10 and 14 after treatment onset. On day 3, wound dynamics was the same in all groups. On day 10 exudate was still observed in the controls; in group two exudation was almost finished and regeneration was about to begin; in groups 3 and 4 the wound defect was filled with granulation tissue. In spite of epidermal repair along the wound edges in groups 2 and 3, there still was some sloughing and granulation tissue was less mature than in group 4. We recommend conducting more extensive clinical research of the leaf extract of cecropin P1-containing transgenic Kalanchoe pinnata.