Dried Escherichia diagnostic agents from live cultures

The possibility of using selected cultures of opportunistic Escherichia, freeze-dried in a saccharose-gelatine medium, as dried diagnostic reagents. In the agglutination test with Escherichia OK diagnostic sera, both fresh and stored for a period of up to 1 year, these dried diagnostic reagents prepared from live cultures showed the same degree of agglutination as live suspensions of similar Escherichia cultures.