Article Text
Research Article
The cryopreservation of standard sera.
Abstract
To determine the storage temperature needed for the preservation of standard sera for serodiagnostic tests, groups of sera were tested before and after storage at -70 degrees C and -20 degrees C for periods of up to five years. The temperature required depended on the nature of the test, but no definite advantage was found in storage at -70 degrees C. For complement fixation this temperature was inadequate and greatly inferior to liquid nitrogen. For immunofluorescence it had no apparent advantage over a temperature of -20 degrees C, and for some other tests it was no more than marginally superior.