Genomic analysis of the vaccinia virus strain variants found in Dryvax vaccine.

Abstract excerpt

Smallpox was eradicated using variant forms of vaccinia virus-based vaccines. One of these was Dryvax, a calf lymph vaccine derived from the New York City Board of Health strain. We used genome-sequencing technology to examine the genetic diversity of the population of viruses present in a sample of Dryvax. These studies show that the conserved cores of these viruses exhibit a lower level of sequence variation...

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