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THE PRESERVATION OF YELLOW FEVER VIRUS.

1. The virus of yellow fever may be preserved for at least 154 days in the blood or liver tissue of infected monkeys if the material is dried in a vacuum while in the frozen state and kept in the refrigator in sealed glass containers. A gradual diminution of virulence is noticeable in the older specimens. 2. If infectious blood is dried in a vacuum at room temperature, instead of in the frozen state, and is stored in sealed containers in the refrigerator, the virus may survive as long as 155 days. 3. The virus may be preserved for at least 30 days in liver kept continuously frozen. 4. Storage …