STABILIZATION OF PERTUSSIS VACCINE IN THE PRESENCE OF BENZETHONIUM CHLORIDE.

Olson, B. H. (Division of Laboratories, Michigan Department of Health, Lansing), Grace Eldering, and Bernice Graham. Stabilization of pertussis vaccine in the presence of benzethonium chloride. J. Bacteriol. 87:543-546. 1964.-Data are presented showing that pertussis vaccine preserved with benzethonium chloride (BC; Phemerol) was inactivated during storage. BC-preserved vaccine stored at 37 C showed no measurable mouse-protective potency at 16 weeks. That stored at 0 to 4 C lost approximately 80% of its potency within 1 year. Treatment of pertussis vaccines with aluminum, calcium, magnesium, choline, or dl-lysine before the addition of the BC prevented its uptake by the cells. Pertussis vaccines pretreated with 0.004 m Ca(++) or 0.0004 m Al(+++) retained 70% of the initial potency after 42 weeks of storage at 37 C. Similar vaccines showed no loss of protective antigens when stored for 1 year at 0 to 4 C.