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Experiments with the infant mouse test demonstrated that there is no need of shaking for heat-stable Escherichia coli enterotoxin production when low volume of medium per volume of flask ratios are used in stationary cultures. Centrifugation and filtration of the cultures to be tested are not necessary either, and Merthiolate (1:10,000) used as preservative has no deleterious effect on heat-stable enterotoxin activity. Based upon these findings, some modifications of the procedures for production and storage of heat-stable enterotoxin preparations are suggested. Standardized pieces of filter papers are wetted with Merthiolated stationary cultures which are to be assayed for heat-stable enterotoxin activity by the infant mouse test. From dried filter papers, heat-stable enterotoxin can be eulted unaltered up to 2 months after specimen preparation. With the proposed modifications, even modestly equipped laboratories will be able to carry out the infant mouse test or at least to prepare specimens to be assayed by more specialized laboratories.

Simplification of methods for the production and storage of specimens to be tested for heat-stable enterotoxin of Escherichia coli