title: Attempt to curtail the observation period of mice in the tetanus vaccine potency tests.
abstract: Curtailing the observation of mice challenged with tetanus toxin in potency test of tetanus vaccine would reduce the agony of mice from spastic paralysis. From the viewpoint of animal welfare, we investigated the feasibility this measure. The potencies of 85 lots of vaccine obtained on the 4th day after challenge were compared with those obtained on the seventh day. No significant difference was found (P = 0.05), indicating that the observation period could be curtailed from 7 days to 4 days without impairing the assessment of the vaccine's potency.
authors.affiliation: Deapartment of Bacterial Pathogenesis and Infection Control, National Institute of Infectious Diseases, Tokyo 208-0011, Japan. yfukuda@nih.go.jp
authors.forename: Tadashi
authors.initials: T
authors.lastname: Fukuda
authors.forename: Masaaki
authors.initials: M
authors.lastname: Iwaki
authors.forename: Takako
authors.initials: T
authors.lastname: Komiya
authors.forename: Yoshichika
authors.initials: Y
authors.lastname: Arakawa
authors.forename: Motohide
authors.initials: M
authors.lastname: Takahashi
mesh_terms: D000827:Animal Welfare; D000818:Animals; D022422:Diphtheria-Tetanus Vaccine; D022681:Diphtheria-Tetanus-acellular Pertussis Vaccines; D004353:Drug Evaluation, Preclinical / Q000379:methods; D051379:Mice; D013745:Tetanus Toxoid; D013997:Time Factors
chemical_list: D022422:Diphtheria-Tetanus Vaccine; D022681:Diphtheria-Tetanus-acellular Pertussis Vaccines; D013745:Tetanus Toxoid