EN
Vaccine B-38 strain of Derzsy’s disease virus (DDV) was used in the study. The virus was lyophilized after the multiplication in the culture of GEF. Sucrose — glutamine, gelatine — sucrose, peptone — lactose and SPGA solutions were applied as stabilizators. The lyophilizates were kept at 4°C for 24 months. The concentrations of the virus in the samples were estimated periodically. It was found that peptone — lactose stabilizator was the most effective protector of DDV from inactivation. The virus was dissolved in Eagle’s fluid, PBS and commercial solvent. The dissolved vaccine was kept at 4°C, 21°C and —20°C for 24 h. The titre of the vaccine was determined immediately after the dissolving and then after 2, 4, 6 and 24 h. Storage of the vaccine at 21° or 4°C for more than 2 h resulted in a significant drop of its titre. Eagle’s fluid used as a disolvent did not differ significantly from the commercial solvent.