Preservation of Influenza Virus Infectivity by Lyophilization
1968
A method of lyophilizing influenza virus in allantoic fluid with retention of high-titer of egg infectivity is described. Five strains of virus were lyophilized, and all were much more stable than fluid virus preparations, retaining 2 to 3 logs of infectivity after storage at 37 C for 60 to 95 days. Statistical analysis of an accelerated storage test by extrapolation of viral degradation indicates that the lyophilized viruses are stable indefinitely at or below room temperature.
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