The Keeping Quality of Freeze-Dried Brucella abortus Strain 19 Vaccine

Abstract
Concentrated Brucella abortus strain 19 vaccine is shown to deteriorate in time, even at low temperatures (4-7[degree]). The loss of viability of vaccine sealed in pure nitrogen can be expressed as a coefficient. The value of this coefficient may be derived from the formula of a straight line fitting the means of the logarithms of the viability counts made 1 week to 6 months after freeze-drying.

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