title: Evaluation of efficacy of stabilizers on the thermostability of live attenuated thermo-adapted Peste des petits ruminants vaccines.
abstract: In this study, thermo-adapted (Ta) PPR vaccines were assessed for their stability at 25, 37, 40, 42 and 45°C in lyophilized form using two extrinsic stabilizers {lactalbumin hydrolysate-sucrose (LS) and stabilizer E} and in reconstituted form with the diluents (1 mol/L MgSO(4) or 0.85% NaCl). The lyophilized vaccines showed an expiry period of 24-26 days at 25°C, 7-8 days at 37°C and 3-4 days at 40°C. LS stabilizer was superior at 42°C with a shelf-life of 44 h, whereas in stabilizer E, a 40 h shelf-life with a comparable half-life was observed. At 45°C, the half-life in stabilizer E was better than LS and lasted for 1 day. Furthermore, the reconstituted vaccine maintained the titre for 48 h both at 4°C and 25°C and for 24-30 h at 37°C. As both the stabilizers performed equally well with regard to shelf-life and half-life, the present study suggests LS as stabilizer as a choice for lyophilization with 0.85% NaCl diluent, because it has better performance at higher temperature. These Ta vaccines can be used as alternatives to existing vaccines for the control of the disease in tropical countries as they are effective in avoiding vaccination failure due to the breakdown in cold-chain maintenance, as this vaccine is considerably more stable at ambient temperatures.
authors: Division of Virology, Indian Veterinary Research Institute, Campus Mukteswar, Nainital District, Uttarakhand, India.
authors: Thachamvally
authors: T
authors: Riyesh
authors: Vinayagamurthy
authors: V
authors: Balamurugan
authors: Arnab
authors: A
authors: Sen
authors: Veerakyathappa
authors: V
authors: Bhanuprakash
authors: Gnanavel
authors: G
authors: Venkatesan
authors: Vinita
authors: V
authors: Yadav
authors: Raj Kumar
authors: RK
authors: Singh
mesh_terms: D000818:Animals; D004355:Drug Stability; D004356:Drug Storage; D005079:Excipients / Q000737:chemistry / Q000494:pharmacology*; D005612:Freeze Drying; D029021:Peste-des-Petits-Ruminants / Q000517:prevention & control*; D013696:Temperature; D014765:Viral Vaccines / Q000737:chemistry / Q000276:immunology*
chemical_list: D005079:Excipients; D014765:Viral Vaccines