Abstract
Capsular antisera against the 72 types of Klebsiella have been prepared in rabbits by using an acetone-dried vaccine. It was shown that encapsulated cells dried with acetone and ground to a fine powder with a mortar and pestle retain their capsules. Antisera obtained from rabbits vaccinated with these vaccines had quellung titers ranging from 1:16 to 1:64. The dried vaccine was stable after storage for over 2 years at room temperature. Encapsulated cultures lyophilized in the presence of 5% sucrose, 5% sodium glutamate, and 5% polyvinylpyrrolidone remained viable and retained their capsules after storage for 10 months at room temperature.
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