Abstract
Human sera were absorbed into electrophoretic paper (Whatman) discs. After drying and storage either at +4 °C or at room temperature (18 °C) for four, seven and 14 weeks, the sera were eluted with distilled water and the diphtheria antitoxin contents were determined. Comparison with the titration of sera stored in the conventional way showed that there had been a significant decrease in titre in the case of discs dried and stored at room temperature. Alternatively, when stored at +4 °C a significant decrease in titre did not take place. This method of storage can thus be used where deep freezing of serum is not available. The storage and the transportation of sera treated in this way is very convenient.
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