Evaluation of five mediums for the stabilization of Brucella abortus strain 19 dessicated by lyophilization

Lyophilized Brucella abortus Strain 19 vaccines were prepared using five recommended mediums. These five vaccines were compared with each other and with liquid vaccine relative to their suitability for (1) maintaning distinguishing cultural characteristics; (2) maintaining viability during lyophilization; (3) quality of restoration; (4) maintaining viability under various storage temperatures and (5) maintaining stable, antigenic and virulence qualities.